function createxmlHttp(){
	    var xmlHttp;
			try{  // Firefox, Opera 8.0+, Safari ,IE7.0
				  xmlHttp=new XMLHttpRequest();
			 }
			catch (e) {  // Internet Explorer
							try{    
								xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");    
							    }
							 catch (e){   
									try
									 {      xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");      }
										catch (e)
										{    
											alert("Your browser does not support AJAX!");    
											 return false;   
										 }  
							 } 
				 } 
        return xmlHttp;
	}