function roll_over(img_name, img_src)
   {

   if (document.all) {
      
      document.all[img_name].src = img_src;
      
      
   }
   
   else {
   
      document[img_name].src = img_src;   
   
   }   
   
   
   }


function changeIndexContent(ct_index) {


   if (document.all) {
   
      var left_div = document.all['xooloo_pres_l'];
      var pres_r_xooloo = document.all['pres_r_xooloo'];
      var pres_r_cutting = document.all['pres_r_cutting'];
      var pres_r_features = document.all['pres_r_features'];
      
   
   
   }

   else {

      var left_div = document.getElementById('xooloo_pres_l');
      var pres_r_xooloo = document.getElementById('pres_r_xooloo');
      var pres_r_cutting = document.getElementById('pres_r_cutting');
      var pres_r_features = document.getElementById('pres_r_features');

   }

   if (left_div && pres_r_xooloo && pres_r_cutting && pres_r_features) {

      switch(ct_index) {

         case 1: 
            
            left_div.style.background="transparent url(../images/accroche_01.png) no-repeat" ;
            pres_r_xooloo.src="images/bt_menu_xooloo_on.png";    
            pres_r_cutting.src="images/bt_menu_cutting_off.png";
            pres_r_features.src="images/bt_menu_features_off.png";
     
            break;
         case 2:
          
            left_div.style.background="transparent url(../images/accroche_02.png) no-repeat" ;   
            pres_r_xooloo.src="images/bt_menu_xooloo_off.png";    
            pres_r_cutting.src="images/bt_menu_cutting_on.png";
            pres_r_features.src="images/bt_menu_features_off.png";    


           break;
         case 3:
            left_div.style.background="transparent url(../images/accroche_03.png) no-repeat" ;
            pres_r_xooloo.src="images/bt_menu_xooloo_off.png";    
            pres_r_cutting.src="images/bt_menu_cutting_off.png";
            pres_r_features.src="images/bt_menu_features_on.png";

            break;

      }

   }

   else {

      alert('missing dom object !!');
   

   }



}