<style type="text/css">

?body{ margin:0; padding:0;}

?#pn{background:#090; width:500px; height:auto; margin:0 auto; text-align:center; display:block;}

?.content{width:500px; text-align:center; height:40px; background:#063; padding:10px; margin:0 auto;}

</style>

<script type="text/javascript">

?var h=0;

?function addh(){

if(h < 300){

h +=5;

? ? document.getElementById("pn").style.height=h+"px";

}

else { ??}

setTimeout("addh()",30);

}

window.onload=function showads(){

addh();

setTimeout("subh()",5000);

}

function subh(){

if(h>0){

h -=5;

document.getElementById("pn").style.height=h+"px";

}

else{}

setTimeout("subh()",300); ?

}

</script>