var cur_tab_active = null;									
	function clickTab(tab, content) {
		if(tab.className=="tab_inactive") {			
			cur_tab_active.className = "tab_inactive";
			cur_tab_active = tab;
			tab.className = "tab_active";
		}
		else {	
			return;
		}
			loadContent(content);	
	}
	function loadContent(page) {
		var URL = "tab_ss.php";
		var data = "content=" + page;
		ajaxLoad("get", URL, data, "mainContent");
		document.getElementById('mainContent').innerHTML = '<div id="preload"><img src="image/loading.gif" alt="" /><br /><br />กำลังโหลดข้อมูล...</div>';
	}