Input frozen after upload completes

<script type="text/javascript" language="JavaScript">

	var agt=navigator.userAgent.toLowerCase(); 
	var is_ie   = (agt.indexOf("msie") != -1); 
	var is_firefox   = (agt.indexOf("firefox") != -1);
	var is_win   = (agt.indexOf("windows") != -1);

var ImageUploader = null;

function formatFileSize(value){
	if (value < 1024){
		return value + " b";
	}
	else if (value < 1048576){
		return Math.round(value / 1024) + " kb";
	}
	else{
		return Math.round(value / 10485.76) / 100 + " mb";
	}
}

function fullPageLoad(){	
	var ImageUploader=getImageUploader("ImageUploader");
	document.getElementById("spanMaxFileCount").innerHTML = ImageUploader.getMaxFileCount();
	document.getElementById("spanMaxTotalFileSize").innerHTML = formatFileSize(parseInt(ImageUploader.getMaxTotalFileSize()));
}

function ImageUploader_UploadFileCountChange(){
	var ImageUploader=getImageUploader("ImageUploader");
	if (ImageUploader){	
		document.getElementById("spanUploadFileCount").innerHTML = parseInt(ImageUploader.getUploadFileCount());
		var imgWidth = parseInt(ImageUploader.getUploadFileCount()) / parseInt(ImageUploader.getMaxFileCount()) * 132;	
		document.getElementById("imgUploadFileCount").style.width = Math.round(imgWidth) + "px";

		document.getElementById("spanTotalFileSize").innerHTML = formatFileSize(parseInt(ImageUploader.getTotalFileSize()));
		imgWidth = parseInt(ImageUploader.getTotalFileSize()) / parseInt(ImageUploader.getMaxTotalFileSize()) * 132;
		document.getElementById("imgTotalFileSize").style.width = Math.round(imgWidth) + "px";
	}
}

function ImageUploader_ViewChange(Pane){
	var ImageUploader=getImageUploader("ImageUploader");
	if (ImageUploader){
		document.getElementById("selectView").selectedIndex = parseInt(ImageUploader.getFolderView());
	}
}

function selectView_change(){
	var ImageUploader=getImageUploader("ImageUploader");
	if (ImageUploader){
		var selectView = document.getElementById("selectView");
		ImageUploader.setFolderView(parseInt(selectView.options[selectView.selectedIndex].value));
	}
}

function ImageUploaderID_BeforeUpload(){
	s="Your files will now be uploaded - please be patient!.";
	alert(s);
}


	var iu = new ImageUploaderWriter("ImageUploader", 571, 400);
	
	//For ActiveX control full path to CAB file (including file name) should be specified.
	iu.activeXControlCodeBase = "/iu6/Scripts/ImageUploader6.cab";
	iu.activeXControlVersion = "6,1,4,0";
	
	//For Java applet only path to directory with JAR files should be specified (without file name).
	iu.javaAppletJarFileName = "ImageUploader6.jar";
	iu.javaAppletCodeBase = "/iu6/Scripts/";
	iu.javaAppletCached = true;
	iu.javaAppletVersion = "6.1.4.0";
	
	iu.addParam("FileMask", "*.jpg;*.jpeg;*.jpe;*.tif;*.tiff;*.tga;*.pcx;*.bmp;*.psd;*.png;*.zip");
	iu.addParam("ShowDescriptions", "false");

	iu.addParam("LicenseKey","XXXX");
	iu.addParam("SignatureFilter","All");
	iu.addParam("ShowDebugWindow","False");
	iu.addParam("Action","order_util_act.php")
	iu.addParam("RedirectUrl","order_prints.php")
	iu.addParam("ShowButtons", "True");
	iu.addParam("AutoRecoverTimeOut", "10000");
	iu.addParam("AutoRecoverMaxTriesCount", "3");

	iu.addParam("TreePaneWidth", "150");
	iu.addParam("FolderPaneHeight", "200");

	iu.addParam("KilobytesText", "KB");	
	iu.addParam("MegabytesText", "MB");
	iu.addParam("ProgressDialogSentText", "Bytes Sent: [Current] of [Total]");
	iu.addParam("ProgressDialogWaitingForResponseFromServerText", "Creating thumbnails...");	
	iu.addEventListener("BeforeUpload", "ImageUploaderID_BeforeUpload");

	if (!is_firefox) {	
		iu.addEventListener("UploadFileCountChange", "ImageUploader_UploadFileCountChange");
		iu.addEventListener("ViewChange", "ImageUploader_ViewChange");
		iu.fullPageLoadListenerName = "fullPageLoad";
	}
	iu.addParam("MaxTotalFileSize", "1048576000");
	
</script>