var viewportwidth;
 var viewportheight;
 if (typeof window.innerWidth != 'undefined')
 {
      viewportwidth = window.innerWidth,
      viewportheight = window.innerHeight
 }
 else if (typeof document.documentElement != 'undefined'
     && typeof document.documentElement.clientWidth !=
     'undefined' && document.documentElement.clientWidth != 0)
 {
       viewportwidth = document.documentElement.clientWidth,
       viewportheight = document.documentElement.clientHeight
 }
 else
 {
       viewportwidth = document.getElementsByTagName('body')[0].clientWidth,
       viewportheight = document.getElementsByTagName('body')[0].clientHeight
 }
 viewportheight1 = viewportheight-49;
 viewportheight2 = viewportheight-154;
 document.getElementById("pageheight").style.height = viewportheight1 + 'px';
 document.getElementById("contentiframe").style.height = viewportheight2 + 'px';