var flag = false;
function smartMark() {
  if(flag == false) {
    markAll();
  }
  else {
    unmarkAll();
  }
  flag = !flag;
}

function popUp(URL) {
day = new Date();
id = day.getTime();
eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=0,width=600,height=500,left = 200,top = 150');");
}

function markAll()
{f=document.forms[1];
 for(i=0;i<f.elements.length;i++)
  {if(f.elements[i].name=="extensions[]") 
       if(!f.elements[i].checked) f.elements[i].click();
  }
}

function unmarkAll()
{f=document.forms[1];
 for(i=0;i<f.elements.length;i++)
  {if(f.elements[i].name=="extensions[]") 
       if(f.elements[i].checked) f.elements[i].click();
  }
}