var Browser = {
  Version: function() {
    var version = 999; // we assume a sane browser
    if (navigator.appVersion.indexOf("MSIE") != -1)
      // bah, IE again, lets downgrade version number
      version = parseFloat(navigator.appVersion.split("MSIE")[1]);
	  return version;
  }
};
function setTop() {
	if(Browser.Version() != 999) {	
		document.getElementById('main').style.top = 0+"px";
		document.getElementById('header').style.top = 0+"px";
	} else {
		document.getElementById('main').style.top = 17+"px";
		document.getElementById('header').style.top = 17+"px";
	}
}