function ridimensionaLinea()
  {
	  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;
	}
/*	window.alert( 'Width = ' + myWidth );
	window.alert( 'Height = ' + myHeight );*/
	
	linea = document.getElementById("linea_bottom");
	linea.style.height = (myHeight-800);
  }