var zoom = 100


function getElementsByClass(searchClass, node, tag) {
 var classElements = new Array();
 if ( node == null ) 
     node = document; 
 if ( tag == null ) 
     tag = '*';
 var els = node.getElementsByTagName(tag);
 var elsLen = els.length;
 var pattern = new RegExp("(^|\\s)"+searchClass+"(\\s|$)");
 for (i = 0, j = 0; i < elsLen; i++) 
 {
  if ( pattern.test(els[i].className) ) 
  {
   classElements[j] = els[i];
   j++;
  }
 }
 return classElements;
}

function zoomIn () {
    if (zoom <= 132) 
        zoom = zoom + 8;
    doZoom();
}


function zoomOut () {
    if (zoom > 100) 
        zoom = zoom - 8;
    doZoom();
}

function doZoom () {
 a = document.getElementById("conteneur");
    b = getElementsByClass("centre", a);
    
    for (i = 0; i < b.length; i++) {
     if (zoom <= 100){
      b[i].style.fontSize = "";
     }
     else {
      b[i].style.fontSize = zoom+"%";
     }        
        /*cibles = b[i].getElementsByTagName("*");
        for (j = 0; j < cibles.length; j++) {
            cibles[j].style.fontSize = zoom+"%";
        }*/
    }
    
    /*
    b = getElementsByClass("col_droite", a);
        
    for (i = 0; i < b.length; i++) {
     if (zoom <= 100){
      b[i].style.fontSize = "";
     }
     else {
      b[i].style.fontSize = zoom+"%";
     }
        /*cibles = b[i].getElementsByTagName("*");
        for (j = 0; j < cibles.length; j++) {
            cibles[j].style.fontSize = zoom+"%";
        }
    }
    */
}