// set-up locations for tab images
    stocksTabs = "../images/courses/tabs_structure/";
  
   

    tab = "";
    tab1 = "";
    tabImages = ""; 

var tabSwitch={
    
   initTabs:function(defaultTab, tabs) {
 
        tab = defaultTab;
        tab1 = defaultTab;

        switch(tabs) {
            case "stocks": 
                tabImages = stocksTabs;
                break;

        }
    }, 
     
    showTab:function(tab1) {
			if (tab1 != tab) {
				eval("document.getElementById('" + tab + "Content').style.display = 'none'");
	            eval("document.getElementById('" + tab + "Tab').src = '" + tabImages + "tab_" + tab + "_off.gif'");
				eval("document.getElementById('" + tab1 + "Content').style.display = 'block'");
	            eval("document.getElementById('" + tab1 + "Tab').src = '" + tabImages + "tab_" + tab1 + "_on.gif'");
				tab = tab1;
			} else {
				// do nothing
			}
    }

}