Enlarge image from imagebutton even after its Imageurl is changed....

Question

Hi..

     Am doing an project in which i need to enlarge an image from imagebutton even after its imageurl is changed.... i have already tried some other codes using javascripts, in tat v can zoom only the particular image of its corresponding imageurl, cant chang wen its updated..... So, I want to update another image in the same imagebutton so tat its corresponding imageurl also should be enlarged in the same button..

                               thanks in advance....