var chatBarOpen=function(e){


    var myAnim = new YAHOO.util.Anim('chat_bar');
    myAnim.attributes.width = { to: 915 };
    myAnim.duration = 0.2;
    myAnim.method = YAHOO.util.Easing.easeOut;
    myAnim.animate();
    YAHOO.util.Dom.setAttribute("chat_bar_toggle_img","onclick","chatBarClose()");
    YAHOO.util.Dom.setAttribute("chat_bar_toggle_img","src","images_perso/chat_bar_toggle_close.png");

      }

    var chatBarClose=function(e){

          var myAnim = new YAHOO.util.Anim('chat_bar');
    myAnim.attributes.width = { to: 0 };
    myAnim.duration = 0.2;
    myAnim.method = YAHOO.util.Easing.easeOut;
    myAnim.animate();
    YAHOO.util.Dom.setAttribute("chat_bar_toggle_img","onclick","chatBarOpen()");
     YAHOO.util.Dom.setAttribute("chat_bar_toggle_img","src","images_perso/chat_bar_toggle_open.png");

      }