function createXMLHttpRequest()
{var ua;if(window.XMLHttpRequest)
{try
{ua=new XMLHttpRequest();}
catch(e)
{ua=false;}}
else if(window.ActiveXObject)
{try
{ua=new ActiveXObject("Microsoft.XMLHTTP");}
catch(e)
{ua=false;}}
return ua;}
req=createXMLHttpRequest();