function getAjaxObject(){ // this function is use to get AjaxObject
	var objAjax = null;
	try{
		objAjax = new XMLHttpRequest();
	}catch(e){
		try{
			objAjax = new ActiveXObject("Msxml2.XMLHTTP");
		}catch(e1){
			try{
				objAjax = new ActiveXObject("Microsoft.XMLHTTP");
			}catch(e2){
				objAjax = null;
			}
		}
	}
	return objAjax;
}