var divup;
var nav;
var x=35;

function init(){
divup=document.getElementById("divup");
nav=document.getElementById("nav");
}
window.onload=init;

function slide(){
if(x<320){
x++;
divup.style.height=x+"px";
nav.style.height=-45+x+"px";
window.setTimeout("slide()",1);
}
}