function validate_email(field,alerttxt) {
	with (field) {
		apos=value.indexOf("@")
		dotpos=value.lastIndexOf(".")
		if (apos<1||dotpos-apos<2) {
			alert(alerttxt);
			return false
		}
		else {
			return true
		}
	}
}
function validate_required(field,alerttxt) {
	with (field) {
		if (value==null||value=="") {
			alert(alerttxt);return false
		}
		else {
			return true
		}
	}
}

function validate_form(thisform) {
	with (thisform) {
		if (validate_required(field_name,"Please enter your name.")==false) {
			field_name.focus();
			return false
		}
		else if (validate_required(field_email,"Please enter an email address.")==false) {
			field_email.focus();
			return false
		}
		else if (validate_email(field_email,"Please enter a valid email address.")==false) {
			field_email.focus();
			return false
		}
		else if (validate_required(field_message,"Please enter a message.")==false) {
			field_message.focus();
			return false
		}
	}
}