function changeTab(n) {
	
	if (document.getElementById("tabbkgrd" + n).style.display="none") {
		document.getElementById("tab" + n).className="active";
		document.getElementById("tabbkgrd" + n).style.display="block";
	} 

toolbarElem = document.getElementById("tabnav");

        var children = toolbarElem.childNodes;
        for (var i = 0; i < children.length; i++) {	
            if (i != n) {
				document.getElementById("tab" + i).className="inactive";
				document.getElementById("tabbkgrd" + i).style.display="none";
			}          
      }
}

function setNavTab(n) {
	document.getElementById("navtab" + n).className="active";
	
}