function isValidEmail(address){
		var emailRegxp = /^([\w]+)(.[\w]+)*@([\w]+)(.[\w]{2,3}){1,2}$/;
		return (emailRegxp.test(address));
	}
	
	function checkForm(){
		fm = document.frmMain;

		if(fm.Your Name.value == ""){
			alert("Please enter your name");
			return false;
		} 
		if(fm.Delivery Address.value == ""){
			alert("Please enter your email address");
			return false;
		} 
		if(!isValidEmail(fm.yourAddress.value)){
			alert("Please enter a valid email address");
			return false;
		} 
		return true;
	}