var preloadFlag = false;

function preloadImages(){
	preloadFlag = true;
}

function changeImages() {
	if (document.images && (preloadFlag == true)) 
	{
		for (var i=0; i<changeImages.arguments.length; i+=2) 
		{	
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}	
}

function displayTemplate(template){
	var win = window.open(template,"templatewin","width=640,height=620");
	win.focus();
}
function openWindow(url){
	var win = window.open(url,"clientsample");
	win.focus();
}
function validate(f){
  if (!checkName(f.name.value)) {
    return false;
  }
  if(!checkEmail(f.email.value)){
	  return false;
  }
  return true;
}

function checkName(string){
 if (string == "") {
    alert("Please enter your name");
    return false;
 }
return true;	
}

function checkEmail(string){
 var pattern = /^.+@.+\..{2,3}$/;
 if (string == "") {
     	alert("Please enter your email address");
	return false;
 }
 if (!(pattern.test(string))){
	alert("Please enter a valid email address");
 	return false;
 }
 return true;
}