// JavaScript Document
var isPost = false;
function validateForm(objForm) {
	if  ( isPost ) {
		alert("You have press the Submit Form button already");
		return false;
	} else if ( IsEmpty(objForm.email1.value)) {
		Warning(objForm.email1 ,"Please specify your E-mail address");
		return false;
	} else if ( ! IsEmail(objForm.email1.value)) {
		Warning(objForm.email1 ,"Please specify your E-mail address in the right format");
		return false;	
	} else {
		isPost = true;
		objForm.btnSubmit1.disabled = true;
		return true;
	}
}	
function clear_textbox()
{
if (document.form1.email1.value == "enter e-mail")
document.form1.email1.value = "";
}