function createDD()
{
  var _dd=document.createElement("div");
  with(_dd.style)
  {
   position="absolute";
   zIndex="100";
   top="0px";
   left="0px";
   width=Math.max(window.document.documentElement.offsetWidth,window.document.body.offsetWidth)+"px";
   height=Math.max(window.document.documentElement.offsetHeight,window.document.body.offsetHeight)+"px";
   filter="alpha(opacity="+70+")";
   opacity=0.7;
   background="black";
   id="dd"; 
  }        
  return _dd;
}

function createBlock()
{
	var _bl=document.createElement('div');
	with(_bl.style)
	{
		width="450px";
		background="white";
		border="1px solid #449AC5";
		position="absolute";
		zIndex="101";
		left=Math.round((Math.max(window.document.documentElement.offsetWidth,window.document.body.offsetWidth)-450)/2)+"px";				
		top="200px";
	}
	return _bl;
}

function closeDDBL()
{
	dd.parentNode.removeChild(dd);
	bl.parentNode.removeChild(bl);
	$('#intro').show();
}