//find page with and height -----------------------------------------------dom scripting on load
          if( typeof window.innerWidth  == 'number' ) {
            pageW = window.innerWidth;
            pageH = window.innerHeight;
          } 
          else if(document.documentElement && 
                     document.documentElement.clientWidth ) {
            pageW = document.documentElement.clientWidth;
            pageH = document.documentElement.clientHeight;
          } 
          else{
            pageW = document.body.clientWidth;
            pageH = document.body.clientHeight;
          }
//adjust the page loc---------------------------------------------------------------------------------------------  	
var elemC = document.getElementById("intro");
var	elemH = document.getElementById("intro").offsetHeight;
	elemC.style.marginTop=(pageH/2)-(elemH/2)+"px";