function validateorder(){

var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i;

if(document.order.address.value==""){
alert("Enter address");
document.order.address.focus();
return false;}

if(document.order.contact_person.value==""){
alert("Enter person name");
document.order.contact_person.focus();
return false;}

if(document.order.phone.value==""){
alert("Enter phone");
document.order.phone.focus();
return false;
}
if(document.order.email.value==""){
alert("enter email id");
document.order.email.focus();
return false;
}
	if(document.order.email.value!="")
	{
		if (filter.test(document.order.email.value))
		{
		}
		else
		{
			alert("Email field contails erroneous data. Please enter a valid Email");
			document.order.email.focus();
		 return false;
		}
	}

}