Upload file to file system with progress bar.

<FORM name="upload" onsubmit="return form_onsubmit()" method="post" encType="multipart/form-data" action="Progress_Save.asp">
	<INPUT type="File" name="File1"><BR>
	<INPUT type="Submit" value="Upload">
</FORM>
<SCRIPT language="javascript">

// define variable to point to progress window
var UploadProgress;

function form_onsubmit()
{
	
	// Create a random session identifier.
	var Session = new String();
	Session = Math.floor(Math.random() * 0xFFFFFF).toString(16);

	// build URL for upload status
	var ProgressUrl = "Progress_Status.asp?Session=" + Session;
	
	// define features for pop-up window
	var Features = new String("");
	
	Features += "toolbar=no, ";
	Features += "menubar=no, ";
	Features += "status=no, ";
	Features += "resizable=no, ";
	Features += "width=200, ";
	Features += "height=200";

	// open the pop-up window
	UploadProgress = window.open(ProgressUrl, "upload", Features);
	
	// append identification of session
	document.upload.action += "?Session=" + Session;
	
	return true;

}
function window_onunload()
{
	// if progress doesn't exist, return
	if(UploadProgress == null){return;}
	
	// if progress doesn't expose closed method
	if(UploadProgress.closed){return}
	
	// close progress window
	UploadProgress.close();
}

// assign event handler to unload event
window.onunload = window_onunload;

</SCRIPT>