function changeTab(el)
{
var inli=document.getElementsByTagName("LI");
	for(var x=0; x < inli.length; x++){
document.getElementsByTagName("LI")[x].style.zIndex=0;
} 

document.getElementById(el).style.zIndex="1"; 

lu_items=document.getElementById("shoutbox_ul").getElementsByTagName("li").length;
for(var n=1; n<lu_items+1; n++){
document.getElementById('shoutbox_btn_i'+n).className='shoutbox_btn_style';
} 
document.getElementById('shoutbox_btn_'+el).className='shoutbox_btn_style_active';


}