/* The following function creates an XMLHttpRequest object... */

function createRequestObject(){
	var request_o; 
	var browser = navigator.appName; //find the browser name
	if(browser == "Microsoft Internet Explorer"){
		request_o = new ActiveXObject("Microsoft.XMLHTTP");
	}else{
		request_o = new XMLHttpRequest();
	}
	return request_o; 
}

var http = createRequestObject(); 


<!-- start For Main Search Category -->
function getMCat(state_id)
{
	//alert(state_id);
	http.open('get', './intermediate.php?mode=main_cat&state_id='+state_id);
	http.onreadystatechange = handleCAT; 
	http.send(null);
}
function handleCAT()
{
	if(http.readyState == 4)
	{ 
		var response = http.responseText;
		document.getElementById('divCAT').innerHTML = response;
	}
}
<!-- end For Main Search Category -->

<!-- start For Main1 Search Category -->
function getMCat1(state_id,c_val)
{
	//alert(state_id);
	http.open('get', './intermediate.php?mode=main_cat1&state_id='+state_id+'c_value='+c_val);
	http.onreadystatechange = handleCAT1; 
	http.send(null);
}
function handleCAT1()
{
	if(http.readyState == 4)
	{ 
		var response = http.responseText;
		document.getElementById('divCAT1').innerHTML = response;
	}
}
<!-- end For Main1 Search Category -->

function EmailValidate(obj)
{
	if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(obj.value))
	{
		return (true)
	}
	ejpAlert("Invalid E-mail Address! Please re-enter.")
	obj.focus();
	return (false)
}
//  End -->