function setHeight() {
 var windowheight;
 var verticalmargin;
 var email_popup_x;
 var email_popup_y;
 if(window.innerHeight) {
  windowheight = window.innerHeight;  
 }
 else if(document.documentElement.clientHeight) {
  windowheight = document.documentElement.clientHeight;
 }
 if(window.innerWidth) {
  windowwidth = window.innerWidth;  
 }
 else if(document.documentElement.clientWidth) {
  windowwidth = document.documentElement.clientWidth;
 }
 verticalmargin = (windowheight - 584) / 2;
 if(verticalmargin < 0) {
  verticalmargin = 0;
 }
 email_popup_x = (windowwidth / 2) - 154;
 email_popup_y = (windowheight / 2) - 97;
 if(email_popup_x < 336) {
  email_popup_x = 336;
 }
 if(email_popup_y < 195) {
  email_popup_y = 195;
 }
 document.getElementById('top').style.height = verticalmargin+'px';
 document.getElementById('bottom').style.height = verticalmargin+'px';
 document.getElementById('background').style.height = windowheight+'px';
 document.getElementById('email_popup').style.left  = email_popup_x+'px';
 document.getElementById('email_popup').style.top  = email_popup_y+'px';
}