function sfBott() {

  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 id="sfBott" style="width:' + myWidth + 'px; height:' + myHeight + 'px;">&nbsp;</div><div id="bott"><a href="http://www.davidenanni.com/"><img src="images/entra.jpg" alt="" border="0" /></a></div>');
  
  
/*
  var opacity = 100;
  var newdiv = document.getElementById('sfBott').style;
  newdiv.opacity = (opacity / 100);
  newdiv.MozOpacity = (opacity / 100);
  newdiv.KhtmlOpacity = (opacity / 100);
  newdiv.filter = "alpha(opacity=" + opacity + ")";
*/

}