function tabswitch(whichtab, whichcontent) {

	document.getElementById('tab_content_1').style.display = 'none';
	document.getElementById('tab_content_2').style.display = 'none';
	document.getElementById('tab_content_3').style.display = 'none';
	document.getElementById(whichcontent).style.display = 'block';

	document.getElementById('tab1').className = 'off';
	document.getElementById('tab2').className = 'off';
	document.getElementById('tab3').className = 'off';
	document.getElementById(whichtab).className = 'on';


}
function commentTab(whichtabC, whichcontentC) {

    document.getElementById('tab_content_4').style.display = 'none';
    document.getElementById('tab_content_5').style.display = 'none';
	document.getElementById(whichcontentC).style.display = 'block';

    document.getElementById('tab4').className = 'off';
    document.getElementById('tab5').className = 'off';
	document.getElementById(whichtabC).className = 'on';


}