var tabname;
var linkname;
var sideArr = new Array("cat","arch","blogr","tg");
var tab;

function showTab(tabname, linkname, classnm)
{
	tab = tabname;
	document.getElementById(tabname).style.display = "block";
	document.getElementById(linkname).className = classnm;
	
	for(i=0;i<sideArr.length;i++)
	{
		templink = sideArr[i]+"1";
		if(linkname != templink)
		{
			document.getElementById(templink).className = "";
			document.getElementById(sideArr[i]).style.display = "none";
		}
	}
}