function switchTab() {
	url = new String(window.location);
	docid = url.substr(url.indexOf('.htm')-6,8);
	while (document.getElementById('atab'+j)) {j++;}
	for(i=1;i<=j-1;i++){ 
		ahref = new String(document.getElementById('atab'+i).href);
		if (ahref.indexOf(docid)!=-1) {
			document.getElementById('atab'+i).href = "#";
			l = i-1;
			g = i+1;
			document.getElementById('tab'+i).className="content-on";
			if (document.getElementById('cm'+l+i).className == "corner-start-off") {document.getElementById('cm'+l+i).className = "corner-start-on"}
			else {document.getElementById('cm'+l+i).className = "corners-mid-off-on";}
			if (document.getElementById('cm'+i+g).className == "corner-end-off") {document.getElementById('cm'+i+g).className = "corner-end-on"}
			else {document.getElementById('cm'+i+g).className = "corners-mid-on-off";}
		}
	}
	document.getElementById('tabs').style.display = "block";
}