function xmlHttpCreate() {
    var xmlHttp;
    try {
        // Firefox, Opera 8.0+, Safari
        xmlHttp=new XMLHttpRequest();
        return xmlHttp;
    }
    catch (e) {
        // Internet Explorer
        try {
              xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
              return xmlHttp;
        }
        catch (e) {
              try {
                  xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
                  return xmlHttp;
              }
              catch (e) {
                  return false;        
              }      
        }    
    }  
}