Custom File Restriction (Image Dimension Aspect Ratio)

<script language="javascript" src="iuembed.js"></script>

<script language="javascript">
function ImageUploader_UploadFileCountChange(){
	var imageUploader=getImageUploader("ImageUploader");
	for (i=imageUploader.UploadItems.Count; i>=1; i--){
		var uploadItem = imageUploader.UploadItems.Item( i)
		if (uploadItem.Height/uploadItem.Width!=0.75){
			alert(uploadItem.FileName + " doesn't have 3:4 ratio.");
			imageUploader.UploadItems.Remove(i);
		}
	}
} 
</script>

<script language="javascript">
var iu = new ImageUploaderWriter("ImageUploader", 770, 500);


//For ActiveX control we specify full path for CAB file
iu.activeXControlCodeBase = "./ImageUploader3.cab";
iu.activeXControlVersion = "3,5,204,0";

//For Java applet we specify only directory with JAR files
iu.javaAppletCodeBase = "./";
iu.javaAppletCached = true;
iu.javaAppletVersion = "1.1.81.0";

iu.addParam("Layout","TwoPanes");
iu.addParam("Action","Upload.aspx")

iu.addEventListener("UploadFileCountChange", "ImageUploader_UploadFileCountChange");

iu.writeHtml();
</script>