var win_popup=null;function openWindow(url,name,params,w,h)
{var ah=window.availHeight;var aw=window.availWidth;var l=(aw- w)/2;var t=(ah- h)/2;params+=params==""?"":",";params+="left=0,top=0,height="+ah+",width="+aw;if(win_popup&&win_popup.open&&!win_popup.closed)
{win_popup.close();}
win_popup=window.open("",name,params);win_popup.location.href=url;}