// JavaScript Document
// Returns size of viewing screen
function getViewportSize()
        {
         var size = [0, 0];
      
         if (typeof window.innerWidth != 'undefined')
         {
           size = [
               window.innerWidth,
               window.innerHeight
           ];
         }
         else if (typeof document.documentElement != 'undefined'
             && typeof document.documentElement.clientWidth !=
             'undefined' && document.documentElement.clientWidth != 0)
         {
           size = [
               document.documentElement.clientWidth,
               document.documentElement.clientHeight
           ];
         }
         else
         {
           size = [
               document.getElementsByTagName('body')[0].clientWidth,
               document.getElementsByTagName('body')[0].clientHeight
           ];
         }
       
         return size;

        }
     
	var dimensions = getViewportSize();

 // end if