function doU(e) {
	if(e == "clear")
		document.contactform.reset();
	else
		if(!Checkfield()) return;
			if(e == "submt")
				document.contactform.submit();
}

function validate(field) {
	var valid = "0123456789.-_() "
	var ok = "yes";
	var temp;
	for (var i=0; i<field.value.length; i++) {
		temp = "" + field.value.substring(i, i+1);
		if (valid.indexOf(temp) == "-1") ok = "no";
	}
	if (ok == "no") {
		alert("Invalid entry! Only numbers and '. - _()' are accepted!");
		field.focus();
		field.select();
   	}
}

function Checkfield() {
	
	if (document.contactform.name.value<=0){
		alert("Please enter your name");
        document.contactform.name.focus();
        return false;
	}

	if (document.contactform.email.value<=0){
		alert("Please enter a valid email address");
        document.contactform.email.focus();
        return false;
	}
	
	if (document.contactform.message.value<=0){
		alert("Please enter the text of your message");
        document.contactform.message.focus();
        return false;
	}
	return true;
}