/**
 * Popup
 * 
 * Exemple d'utilisation : popup({url:"http://www.google.fr",width:500,height:500,options:""});
 */
function popup(params) {   
    // Initialisation des paramètres du popup.
    // params.url     =    (params.url == undefined) ? undefined : params.url;
    params.url     =    (params.url == undefined && (typeof params.url == "object")) ? $(params.url).attr("href") : params.url;
    params.name    =    (params.name == undefined) ? "" : params.name;
    params.width   =    (params.width == undefined) ? 500 : params.width;
    params.height  =    (params.height == undefined) ? 500 : params.height;
    params.options =    ((params.options == undefined) ? "resizable=yes,scrollbars=yes" : params.options);
    params.top     =    (screen.height-500)/2;
    params.left    =    (screen.width-500)/2;	   
   
    
    var popup        = window.open(params.url, params.name, "top=" + params.top + ",left=" + params.left + ",width=" + params.width + ",height=" + params.height + "," + params.options);
    return false;
}