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Message: [QUOTE="SAM, post: 4971003"] Ben a écrit : did you code it ? or do you use prototype's library ? <html> <style type="text/css"> img { width: 100px; } </style> <script type="text/javascript"> function getSize(imgId) { var i = document.getElementById(imgId); var siz = function(what) { what.widss = what.naturalWidth? what.naturalWidth : what.width; what.heigt = what.naturalHeight? what.naturalHeight : what.height; return what; } i = siz(i); if(!i.widss) setTimeout(function(){getSize(imgId)},200); else return [i.widss, i.heigt]; } window.onload = function() { alert(getSize('V_2').join(' ')); } </script> All images displayed in 100px width : <img src="[URL]http://i11.ebayimg.com/01/i/000/ed/13/575b_1.JPG[/URL]" alt="" id="V_1" onload="alert(this.width+' '+this.height);"> <img src="[URL]http://i16.ebayimg.com/01/i/000/ed/13/562b_1.JPG[/URL]" alt="" id="V_2"> <img src="[URL]http://i3.ebayimg.com/03/i/000/e2/fe/aa08_1.JPG[/URL]" alt="" id="V_3"> size of image #: <select onclick="alert(getSize('V_'+(+this.selectedIndex+1)).join(' '))"> <option>1 <option>2 <option>3 </select> </html> [/QUOTE]