$(document).ready(function(){

$('#contact_form').submit(function(){
	if($("#name").val()==""){
		alert("Please enter your name");
		$("#name").focus();
		return false;
	}
	if($("#email").val()==""){
		alert("Please enter your email address");
		$("#email").focus();
		return false;
	}
	if($("#subject").val()==""){
		alert("Please enter the subject of your request");
		$("#subject").focus();
		return false;
	}
	if($("#comments").val()==""){
		alert("Please enter your comments");
		$("#comments").focus();
		return false;
	}
});

});