function ShowValidImage(obj,path) {
        var numkey = Math.random();
//        obj.src = path+"/ValidCode.aspx?NumKey="+numkey;
        obj.src = "ValidCode.aspx?NumKey="+numkey;
}

function InputValidShowImg(obj)
{
    var array=obj.src.split('?')[0].split('.');
    if(array[array.length-1]!="aspx")
    {
        ShowValidImage(obj,'');
    }
}