function contact(){
	
	var regExpr=new RegExp("^([a-zA-Z0-9_.-]+[@][a-zA-Z]+[.](([a-z]{3})|([a-z]{2}[.][a-z]{2})))+$");		
	var name=document.getElementById('name').value;
	if(name==''){
		alert("Please enter your name.");	
		document.getElementById('name').focus();
		return false;
	}
	var email=document.getElementById('email').value;
	if(email==''){
		alert("Please enter your email.");	
		document.getElementById('email').focus();
		return false;
	}
	if(!email.match(regExpr)) {
		alert("Please enter valid email.");	
		document.getElementById('email').focus();
		return false;	
		}
	var comments=document.getElementById('comments').value;
	if(comments==''){
		alert("Please enter your comments.");	
		document.getElementById('comments').focus();
		return false;
	}	
}