function validateField(field,message,regexp){
	var bEmpty=false;
	var strAction='enter';
	var field_value='';
	var xField=(field.length>0 && !field.type)?field[0]:field;
	var selectedIndex=-1;
	
	switch(xField.type){
		case 'textarea':
		case 'hidden':
		case 'password':
		case 'file':
		case 'text':{
			field_value=field.value;
			bEmpty=(field_value.length<1);
			break;
		}
		case 'select-one':{
			field_value=field.options[field.selectedIndex].value;
			bEmpty=(field.selectedIndex<0 || field_value.length<1);
			strAction='select';
			break;
		}
		case 'checkbox':
		case 'radio':{
			strAction='select';
			bEmpty=true;
			if(xField!=field){
				for(var intIdx=0;intIdx<field.length;intIdx++){
					if(field[intIdx].checked){
						bEmpty=false;
						selectedIndex=intIdx;
						break;
					}
				}
			}
			else
				bEmpty=!xField.checked;
			break;
		}
		default:{
			bEmpty=true;
			alert('form element \''+xField.name+'\' ['+xField.type+'] is not supported by checkEmpty() function');
			break;
		}
	}
	
	if(regexp && !bEmpty){
		bEmpty=!regexp.test(field_value);
	}
	
	if(bEmpty){
		if(message) alert(message);
		else alert('Please '+strAction+' a value for field \''+xField.name+'\'');
		if(xField.type!='hidden') xField.focus();
	}
	
	return (xField.type=='radio')?selectedIndex:!bEmpty;
}

//Remove spaces from start and end of a string
function trim(value) {
   var temp = value;
   var obj = /^(\s*)([\W\w]*)(\b\s*$)/;
   if (obj.test(temp)) { temp = temp.replace(obj, '$2'); }
   var obj = / +/g;
   temp = temp.replace(obj, " ");
   if (temp == " ") { temp = ""; }
   return temp;
}

function ValidateNumeric(control){
	control.value=trim(control.value);
	if(!IsNumeric(control.value)){
		alert('Please enter numeric values only');
		control.focus();}}

function removeChar(Target){
	var re=/[^0-9]/g;
	Target=Target.replace(re,'');
	return Target;}

function removeNonNum(Target){
	var re=/[^0-9|\^.|\^-]/g;
	Target=Target.replace(re,'');
	return Target;}

function removeDigit(Target){
	var re=/[0-9]/g;
	Target=Target.replace(re,'');
	return Target;}

function IsEmail(strEmail)
{
	var status = false;
	var strEmailAddress = new String(strEmail);
	var strEmailPattern = (/^[a-z0-9](\.\w|\w)*@[a-z0-9](\.\w|\w)*\.[a-z]{2,3}$/i);

	if (strEmailAddress.search(strEmailPattern)==0)
	{
		status = true;
	}
	return status;
}

function IsCreditCard(strCC){
	strCC=removeChar(strCC);
	if(strCC.length<16) return false;
	if(strCC.length > 19) return false;
	
    sum = 0; mul = 1; l = strCC.length;
	for (i = 0; i < l; i++){
		digit = strCC.substring(l-i-1,l-i);
		tproduct = parseInt(digit ,10)*mul;
		if (tproduct >= 10) sum += (tproduct % 10) + 1;
		else sum += tproduct;
		if (mul == 1) mul++;
		else mul--;
	}
	if ((sum % 10) != 0) return false;

 	return true;
}