//resize thumb

		function defSize(img)
		{
			var maxSz = document.forms['cat'].elements['maxSz'].value;
 			var imgW = document.images[img].width;
			var imgH = document.images[img].height;
			imgsz = scaleSize(maxSz, maxSz, imgW, imgH);
			return [imgsz[0], imgsz[1]];
			
		}
		
		function scaleSize(maxW, maxH, currW, currH)
		{
			var ratio = currH / currW;
			
			if(currW >= maxW && ratio <= 1)
			{
				currW = maxW;
				currH = currW * ratio;
			} 
			else if(currH >= maxH)
			{
			currH = maxH;
			currW = currH / ratio;
			}
			
			return [currW, currH];
		
		}


		function listimg()
		{
			var imgtags = document.getElementsByTagName('img');

			for(i=0;i<imgtags.length;i++)
			{
				var img = imgtags[i].id
				if (img.length>0)
				{
					if (!document.forms['cat'].elements['maxSz'])
						{ 
						alert ("maxSz pas trouvé!") 
						return false
						}
					document.images[img].width = defSize(img)[0];
					document.images[img].height = defSize(img)[1];
				}
			}
		}