javascript check if text is overflowing
// Determines if the passed element is overflowing its bounds,
// either vertically or horizontally.
// Will temporarily modify the "overflow" style to detect this
// if necessary.
function checkOverflow(el)
{
   var curOverflow = el.style.overflow;
   if ( !curOverflow || curOverflow === "visible" )
      el.style.overflow = "hidden";
   var isOverflowing = el.clientWidth < el.scrollWidth 
      || el.clientHeight < el.scrollHeight;
   el.style.overflow = curOverflow;
   return isOverflowing;
}