var panels = new Array('panel1', 'panel2'); // IDs of the content panels must be put here
var tabs = new Array('tab1', 'tab2'); // IDs of the tabs must be put here
function displayPanel(nval)
{
	 for(i = 0; i < panels.length; i++)
	 {
		 document.getElementById(panels[i]).style.display = (nval-1 == i) ? 'block':'none';
		 document.getElementById(tabs[i]).className=(nval-1 == i) ? 'tab_sel':'tab';
	 }
}