// JavaScript Document
var myWidth = 0, myHeight = 0;
if(typeof(window.innerWidth) == 'number') {
  //Non-IE
  myWidth = window.innerWidth; myHeight = window.innerHeight;
}else if(document.documentElement && (document.documentElement.clientWidth || document.documentElement.clientHeight)) {
  //IE 6+ in 'standards compliant mode'
  myWidth = document.documentElement.clientWidth; myHeight = document.documentElement.clientHeight;
}else if(document.body && (document.body.clientWidth || document.body.clientHeight)) {
  //IE 4 compatible
  myWidth = document.body.clientWidth; myHeight = document.body.clientHeight;
}
document.write('<div style="height:' + Math.ceil((myHeight-525)/2) + 'px; width:' + (myWidth-40) + 'px;"></div>');