Hi,

 

You'd better setTimeout to check whether the uploader is initialized after AJAX postback.

 

for example:

 

function StartUpload()
{
var submitbutton=document.getElementById('<%=SubmitButton.ClientID %>');
var uploadobj=document.getElementById('<%=Uploader1.ClientID %>');
if(!uploadobj.startupload)//not initilaized
{
 setTimeout(StartUpload,10);
 return;
}

...other code.

}

 

Regards,
Terry