function GetXmlHttpObject(){
   if(window.XMLHttpRequest){
            try{    
				xmlHttp = new XMLHttpRequest();
                if(xmlHttp.overrideMimeType){
                    xmlHttp.overrideMimeType('text/html');
                }
            }
            catch(e){
            	xmlHttp = null;
            }
        }else if(window.ActiveXObject){
            try{
                xmlHttp = new ActiveXObject('Msxml2.XMLHTTP');
        	}
	        catch(e){
	    		try{
	            	xmlHttp = new ActiveXObject('Microsoft.XMLHTTP');
	            }
	            catch(e){
	            	xmlHttp = null;
	            }
	        }
	    }
		return xmlHttp;
	}