function GetSize(file)
{
var fso=new ActiveXObject("Scripting.FileSystemObject");
var f=fso.getFile(file);
return fso.getFile(file).size;
}
function checkFileSize(ctrl){



//check if file size is > 100kb

if(GetSize(ctrl.value)>100000)//10 MB=10485760 B

{

alert('Sorry file size > 1KB');

ctrl.upload.reset();//file grater than 10MB then reset form

}
}