html - resize button image using javascript -

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i want following button (and it's image) change size when click it. dialog showing, size not changing.. 

<html>     <input type="image" src="pacman.png"  onclick="         alert('test');         this.height='200px'; // change de button size         // this.image.height='200px'; // not sure if line work..     "/> </html>

need in javascript, no in css, becouse i'll make animation later..

you have manipulate "style" property:

this.style.height = '200px';

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