function CheckForm(form)
{
	var i;
	var arr;
	var str;
	var fname;
	var x;
	var test;
	var fieldval;

	for (i=0;i<form.elements.length;i++)
	{
		if(form.elements[i].name.substr(0,4) == "CHK_")
		{			
			
			str = GetFieldValueByName(form,form.elements[i].name.substr(4));
			
			if(str != null)			
			{
			
				str = Trim(str);
							
				arr = form.elements[i].value.split("|");

				fname = form.elements[i].name.replace("CHK_","");

				// alert("Checking "+fname+" Type "+arr[0]);
			
				switch(arr[0])
				{
					case "CKB":
						//check mandatory field	

						if (!(GetFieldCheckedByName(form,form.elements[i].name.substr(4)))  && (arr[3] == "True"))
						{
							alert("You must select an answer for field " + arr[4] );

							return false;
						
						}

						test = GetFieldCheckedValueByName(form,form.elements[i].name.substr(4));
						if (test)
						{
							fieldval=eval("form.elements['"+fname+"_Other'].value");
							if (test && fieldval=="")
							{
								alert("You must give an answer for 'Other' in " + arr[4] );
								return false;	
							}
							if (!test && fieldval!="")
							{
								alert("You must tick 'Other' if you give an answer for 'Other' in " + arr[4] );
								return false;	
							}
						}

						break;

					case "RAD":
						//check mandatory field	

						if (!(GetFieldCheckedByName(form,form.elements[i].name.substr(4)))  && (arr[3] == "True"))
						{
							alert("You must select an answer for field " + arr[4]);

							return false;
						
						}

						test = GetFieldCheckedValueByName(form,form.elements[i].name.substr(4));
						if (test)
						{
							fieldval=eval("form.elements['"+fname+"_Other'].value");
							if (test && fieldval=="")
							{
								alert("You must give an answer for 'Other' in >" + arr[4] + "<");
								return false;	
							}
							if (!test && fieldval!="")
							{
								alert("You must tick 'Other' if you give an answer for 'Other' in " + arr[4]);
								return false;	
							}
						}

						break;

					case "LBO":

						//check mandatory field	List Box Other

						var MyField = Replace(form.elements[i].name.substr(4),"_Other","");

						var test = eval("document.Booking." + MyField +".value");

						if ((str.length == 0) && (arr[3] == "True") && (test=="99 Other"))
						{
							alert("The field >" + arr[4] + "< must be filled in");
							eval("form."+fname+".focus()");
							return false;
						}

						break;

					case "RADO":

						//check mandatory field	Radio CheckBox Other

						alert("Checking Radio Other");

						var MyField = Replace(form.elements[i].name.substr(4),"_Other","");

						alert(MyField);

						test = GetFieldCheckedValueByName(form,MyField);

						alert(test);

						if ((str.length > 0) && (arr[3] == "True") && (!test))
						{
							alert("You must tick/select 'Other' if you give an answer for 'Other' in " + arr[4] );
							eval("form."+fname+".focus()");
							return false;
						}

						break;

					case "EMA":
						//check mandatory field	
						
						if ((str.length == 0) && (arr[3] == "True"))
						{
							alert("The field >" + arr[4] + "< must be filled in");
							eval("form."+fname+".focus()");
							return false;
						}
						
						 if (str.indexOf("@") == -1)
						{
      							alert("Please enter a valid email address (you have not entered an @ sign)");
							eval("form."+fname+".focus()");
      							return false;
    						}

						 if (str.indexOf(".") == -1)
						{
      							alert("Please enter a valid email address (you have not entered a full stop anywhere)");
							eval("form."+fname+".focus()");
      							return false;
    						}

						break;

					case "STR":
						//check mandatory field	
						
						if ((str.length == 0) && (arr[3] == "True"))
						{
							alert("The field " + arr[4] + " must be filled in");
							eval("form."+fname+".focus()");
							return false;
						}
						
						//check min length	
						if (str.length < parseInt(arr[1]))
						{
							alert("The value in field " + arr[4] + " is too short");
							eval("form."+fname+".focus()");
							return false;
						}
						
						//check max length
						if (str.length > parseInt(arr[2]))
						{
							alert("The value in field " + arr[4] + " is too long");
							eval("form."+fname+".focus()");							
							return false;
						}
						break;
											
					case "INT":
																
						//check mandatory field
						if ((str.length == 0) && (arr[3] == "True"))
						{
							alert("The field " + arr[4] + " must be filled in");
							eval("form."+fname+".focus()");
							return false;
						}
						
						//check sanity
						if(!(IsNumeric(str)))
						{
							alert("The value in field " + arr[4] + " is numeric only");
							eval("form."+fname+".focus()");
							return false;
						}
												
						//check min value
						if (arr[1] != "x")
						{
							if (parseInt(str) < parseInt(arr[1]))
							{
								alert("The value in field " + arr[4] + " is too small");
								eval("form."+fname+".focus()");
								return false;
							}
						}
						
						//check max length
						if (arr[2] != "x")
						{
							if (parseInt(str) > parseInt(arr[2]))
							{
								alert("The value in field " + arr[4] + " is too big");
								eval("form."+fname+".focus()");
								return false;
							}
						}
						
						break;
					
					case "FLOAT":
																		
						//check mandatory field
						if ((str.length == 0) && (arr[3] == "True"))
						{
							alert("The field " + arr[4] + " must be filled in");
							eval("form."+fname+".focus()");
							return false;
						}
						
						//check sanity
						if(!(IsNumeric(str)))
						{
							alert("The value in field " + arr[4] + " is numeric only");
							eval("form."+fname+".focus()");
							return false;
						}
												
						//check min value
						if (arr[1] != "x")
						{
							if (parseFloat(str) < parseFloat(arr[1]))
							{
								alert("The value in field " + arr[4] + " is too small");
								eval("form."+fname+".focus()");
								return false;
							}
						}
						
						//check max length
						if (arr[2] != "x")
						{
							if (parseFloat(str) > parseFloat(arr[2]))
							{
								alert("The value in field " + arr[4] + " is too big");
								eval("form."+fname+".focus()");
								return false;
							}
						}
						
						break;
										
						
					case "DATE":
						
						//check mandatory field
						if ((str.length == 0) && (arr[3] == "True"))
						{
							alert("The field " + arr[4] + " must be filled in");
							eval("form."+fname+".focus()");
							return false;
						}
						
						//check sanity
						if(!(IsDate(str)))
						{
							alert("The value in field " + arr[4] + " is not a valid date (MM/DD/YYYY)");
							eval("form."+fname+".focus()");
							return false;
						}
						
						//check min value
						if (arr[1] != "x")
						{
							if (GetDate(str) < GetDate(arr[1]))
							{
								alert("The date in field " + arr[4] + " is less than the minimum date");
								eval("form."+fname+".focus()");
								return false;
							}
						}
						
						//check max length
						if (arr[2] != "x")
						{
							if (GetDate(str) > GetDate(arr[2]))
							{
								alert("The value in field " + arr[4] + " is later than the maximum date");
								eval("form."+fname+".focus()");
								return false;
							}
						}
						
						break;
				}
			}
		}
	}
	
	return true;

}

//============================================================================================

function Replace(string,replacechar,replacewith) 
{
	var temp = "";
	var i;
	
	string = '' + string;
	splitstring = string.split(replacechar);
	for(i = 0; i < splitstring.length; i++)
	{
		if(i < (splitstring.length -1))
			temp += splitstring[i] + replacewith;
		else
			temp += splitstring[i];
	}
	return temp;
}

//============================================================================================

function GetFieldValueByName(form,name)
{
	var i;
	
	for (i=0;i<form.elements.length;i++)
	{
		if(form.elements[i].name == name)
			return (form.elements[i].value);
	}
	return null;
}

/*

======================= CHECK CHECKED! =======================================

*/

function GetFieldCheckedByName(form,name)
{
	var i;
	var ccheck;
	ccheck = false;
	
	for (i=0;i<form.elements.length;i++)
	{
		if((form.elements[i].checked) && (form.elements[i].name == name))
			{
				return true;
			}
	}
	return(ccheck);
}

function GetFieldCheckedValueByName(form,name)
{
	var i;
	var ccheck;

	ccheck = false;
	
	for (i=0;i<form.elements.length;i++)
	{
		if((form.elements[i].checked) && (form.elements[i].name == name))
		{
			if(form.elements[i].id == "Other_"+name)
			{
				ccheck=form.elements[i].checked;
			}
		}
	}
	return(ccheck);
}

/*

======================= STANDARD HELPER FUNCTIONS BELOW =======================================

*/
function IsNumeric(str)
{
	var i;
	for(i=0;i<str.length;i++)
	{
		if(!(	((str.charAt(i) <= '9') && (str.charAt(i) >= '0')) ||
				(str.charAt(i) == ' ') || (str.charAt(i) == '.') || (str.charAt(i) == '-')))
			return(false);
	}
	return(true);
}

//============================================================================================

function IsAlphaNumeric(str)
{
	var i;
	for(i=0;i<str.length;i++)
	{
		if(!(	((str.charAt(i) <= '9') && (str.charAt(i) >= '0')) ||
				((str.charAt(i) <= 'z') && (str.charAt(i) >= 'a')) ||
				(str.charAt(i) == ' ') || (str.charAt(i) == '-') ||
				(str.charAt(i) == 'ü') || (str.charAt(i) == 'ä') ||
				(str.charAt(i) == 'ö') || (str.charAt(i) == 'Ü') ||
				(str.charAt(i) == 'Ä') || (str.charAt(i) == 'Ö') ||
				(str.charAt(i) == 'é') || (str.charAt(i) == 'ß') ||
				((str.charAt(i) <= 'Z') && (str.charAt(i) >= 'A')) ))
			return(false);
	}
	return(true);
}

//============================================================================================

function IsAlpha(str)
{
	var i;
	
	for(i=0;i<str.length;i++)
	{
		if(!(	((str.charAt(i) <= 'z') && (str.charAt(i) >= 'a')) ||
				(str.charAt(i) == ' ') || (str.charAt(i) == '-') ||
				(str.charAt(i) == 'ü') || (str.charAt(i) == 'ä') ||
				(str.charAt(i) == 'ö') || (str.charAt(i) == 'Ü') ||
				(str.charAt(i) == 'Ä') || (str.charAt(i) == 'Ö') ||
				(str.charAt(i) == 'é') || (str.charAt(i) == 'ß') ||
				((str.charAt(i) <= 'Z') && (str.charAt(i) >= 'A')) ))
			return(false);
	}
	return(true);
}

//============================================================================================

function Trim(str)
{
	//trim leding spaces
	while(true)
	{
		if(str.charAt(0) == ' ')
			str = str.substr(1);
		else
			break;
	}
	
	//trim trailing spaces
	while(true)
	{
		if(str.charAt(str.length-1) == ' ')
			str = str.substr(0,str.length-1);
		else
			break;
	}
	return(str);	
}

//============================================================================================

function IsDate(argDate)
{
	var date_split;
	var i;
	var tdate, tmonth, tyear;
	
	date_split = argDate.split('/');
	
	//check for date parts
	if(date_split.length != 3)
		return(false);
		
	//check for zero values
	for(i=0;i<date_split.length;i++)
	{
		if(parseInt(date_split[i]) == 0)
			return(false);
	}
	
	//check for 4-digit year
	if(date_split[2].length != 4)
		return(false);
		
	//check for valid date, e.g. 02/29/1997
	tdate = parseInt(date_split[1]);
	tmonth = parseInt(date_split[0]);
	tyear = parseInt(date_split[2]);
	
	var date = new Date(parseInt(date_split[2]),parseInt(date_split[0])-1,parseInt(date_split[1]));
	
	if(date.getDate() != tdate)
		return(false);
	
	if(date.getMonth() != (tmonth-1))
		return(false);
	
	if(date.getFullYear() != tyear)
		return(false);
		
	return(true);
}


function GetDate(argDate)
{
	//use IsDate() first !!!!
	
	var date_split;	
	var tdate, tmonth, tyear;
	
	date_split = argDate.split('/');
	
		
	
	tdate = parseInt(date_split[1]);
	tmonth = parseInt(date_split[0]);
	tyear = parseInt(date_split[2]);
	
	return date = new Date(parseInt(date_split[2]),parseInt(date_split[0])-1,parseInt(date_split[1]));
		
}