function selTab(index)
{
	document.getElementById("tab1").className="tab_1_n";
	document.getElementById("tab2").className="tab_1_n";
	document.getElementById("tab3").className="tab_1_n";
	document.getElementById("tab4").className="tab_1_n";
	document.getElementById("tab5").className="tab_1_n";
	document.getElementById("tab_content1").className="tab_content_1_n";
	document.getElementById("tab_content2").className="tab_content_1_n";
	document.getElementById("tab_content3").className="tab_content_1_n";
	document.getElementById("tab_content4").className="tab_content_1_n";
	document.getElementById("tab_content5").className="tab_content_1_n";
	document.getElementById("tab"+index).className="tab_1";
	document.getElementById("tab_content"+index).className="tab_content_1";
}