// Background Positioner
// This script centers a large background in browsers that can't fit it

var bgSpace  = document.getElementById("wrapbackground").clientWidth;
var bgImage  = document.getElementById("backgroundimage");
var bgShift;

if( bgSpace != undefined && bgSpace < bgImage.clientWidth ) {
  bgShift    = -((bgImage.clientWidth - bgSpace) / 2);
  bgImage.style.left = Math.round(bgShift) + 'px';
} // ! browser too short?