var ResizeMsg = 'L\'image a été réduite, cliquez pour l\'ouvrir en taille réelle.';
var WidthMax = 600;
var WidthSizeTo = 600;
var imgClassName = 'imglimit';

function ImageResize() {
if (document.images.length) {
var docImg = document.images;
   for ( var i = 0 ; i < docImg.length ; i++)
      if (docImg[i].width > WidthMax && docImg[i].class != 'header' && docImg[i].class != 'footer') {
         docImg[i].width = WidthSizeTo;
         docImg[i].title = ResizeMsg;
         docImg[i].className = imgClassName;
         docImg[i].onclick = ImageWinOpen;
      }
   }
}

function ImageWinOpen(e) {
	if( window.event )
	   window.open(window.event.srcElement.src,'vbIMG','menubar=no, toolbar=no, location=no, directories=no, fullscreen=no, titlebar=yes, hotkeys=no, status=no, scrollbars=yes, resizable=yes');
	else
	   window.open(e.target.src,'vbIMG','menubar=no, toolbar=no, location=no, directories=no, fullscreen=no, titlebar=yes, hotkeys=no, status=no, scrollbars=yes, resizable=yes');
}

window.onload = ImageResize();