function validate_contact_us(form){
	if(form.name.value==''){
		alert("Please enter your name");	
		form.name.focus();
		return false;
	}	

		var str=form.email.value;
		var filter=/^.+@.+\..{2,3}$/;
	
		if (!filter.test(str)){
			alert("Please input a valid email address!");
			form.email.focus();
			return false;		
		}		

	if(form.message.value==''){
		alert("Please enter your message");	
		form.message.focus();
		return false;
	}	

	return true;
}