function visit(newURL) {
      if (newURL != "") {
        parent.mainFrame.location=newURL
      }
    }


var layer_cour = null; 

function show(object) { 
   if (object != null){ 
     if (document.getElementById) 
        var obj = document.getElementById(object);
        if (obj != null) obj.style.visibility = 'visible';   
     else if (document.layers) { 
        if (document.layers[object] != null)
           document.layers[object].visibility = 'visible';
     } 
     else if (document.all) // instructions pour IE 4, 5 & 6 
        var obj = document.all[object];
        if (obj != null) obj.style.visibility = 'visible'; 
  } 
} 

function hide(object) { 
   if (object != null){ 
     if (document.getElementById) 
        var obj = document.getElementById(object);
        if (obj != null) obj.style.visibility = 'hidden';   
     else if (document.layers) { 
        if (document.layers[object] != null) 
           document.layers[object].visibility = 'hidden';  
     } 
     else if (document.all) 
        var obj = document.all[object];
        if (obj != null) obj.style.visibility = 'hidden';
  } 
} 

function mouseOver(object) { 
   if (layer_cour != null) 
      hide (layer_cour); 
   if (object != null) { 
      show(object); 
      layer_cour = object; 
   } 
   else layer_cour = null; 
} 


function mouseClose() { 
   if (layer_cour != null) 
      hide (layer_cour); 
  
}