function VNUM(field) {
	var valid = "0123456789"
	var ok = "yes";
	var temp;
	for (var i=0; i<field.value.length; i++) {
	temp = "" + field.value.substring(i, i+1);
	if (valid.indexOf(temp) == "-1" || valid.value == "" ) ok = "no";
	}
	if ((ok == "no") || (field.value=="")) {
		return false;
	}
return true;
}


function VTEXT(field) {
	if (( field.value=="" ) || ( field.value=="  " )  ||( field.value=="   " )  ||( field.value=="    " )  ||( field.value=="     " )) {
		return false;
	}
	return true;
}

function VINT(field,int) // alanin sayilarini kontrol ediyor int e esitse true yoksa false donduruyor
{
	if (VNUM(field))
	{
		if (field.value.length == int)
			{
			return true;
			}
		else
		{
		return false;
		}
	}
	else 
	{
	 return false;
	}
}

function VSELECT(field,fieldname) {
	if (( field.value=="" ) ) {
	alert("Warning !\n" + fieldname + " must be selected. ");
	field.focus();
	return false;
	   }
	return true;
}


function isEmail(email){
    return /^.+\@(\[?)[a-zA-Z0-9\-\.]+\.([a-zA-Z]{2,3}|[0-9]{1,3})(\]?)$/.test(email);
}


function CheckForm()
{ 


	var ErrorMessage = new Array();
	var ErrorElement = new Array();

	if(VTEXT(document.contactform.hotel) != true){
	    ErrorMessage.push('Please select hotel');
	    ErrorElement.push(document.contactform.hotel);
	}
	
	if(VTEXT(document.contactform.name) != true){
	    ErrorMessage.push('Please enter name surname');
	    ErrorElement.push(document.contactform.name);
	}
	
	if(isEmail(document.contactform.email.value) != true){
	    ErrorMessage.push('Please enter a valid email address');
	    ErrorElement.push(document.contactform.email);
	}
	
	
	if(VTEXT(document.contactform.subject) != true){
	    ErrorMessage.push('Please enter subject');
	    ErrorElement.push(document.contactform.subject);
	}
	
	if(VTEXT(document.contactform.comments) != true){
	    ErrorMessage.push('Please enter comments');
	    ErrorElement.push(document.contactform.comments);
	}
	
	if(VTEXT(document.contactform.security_code) != true){
	    ErrorMessage.push('Please enter security code');
	    ErrorElement.push(document.contactform.security_code);
	}	
	
	
	if(ErrorMessage.length == 0){
	    document.contactform.submit();
	} else {
	    alert(ErrorMessage.join("\n"));
	    ErrorElement[0].focus();
	}
}