function tabChange(tabNo, tablength) {

	var i;

	for (i = 1; i <= tablength; i++) {
		document.getElementById("tabsel" + i).className = "tab_selector";
		document.getElementById("tab" + i).className = "hide";
	}

	document.getElementById("tabsel" + tabNo).className="tab_selector selected";

	document.getElementById("tab" + tabNo).className="tab";

}