window.onload = function(){
        var strCook = document.cookie;

		document.getElementById('main').style.height = (document.documentElement.clientHeight-20)+'px';
		document.getElementById('main').style.overflow = 'auto';

        if(strCook.indexOf("!~")!=0){
          var intS = strCook.indexOf("!~");
          var intE = strCook.indexOf("~!");
          var strPos = strCook.substring(intS+2,intE);
          document.getElementById("nav_left").scrollTop = strPos;
        }
}

function SetDivPosition(){
        var intY = document.getElementById("nav_left").scrollTop;
        document.cookie = "yPos=!~" + intY + "~!"+"; path=/";
}