function addScript_createRandom()
{
  return Math.floor( Math.random() * 500000000 + 1 );
}
/*
var addScriptRandom = addScript_createRandom();
var el = document.createElement( "script" );
el.setAttribute( "type", "text/javascript" );
el.setAttribute( "src", "popin.php?rand="+addScriptRandom);
document.getElementsByTagName( "head" )[ 0 ].appendChild( el ); 
*/