function displayReverse(tab_id) 
{
    tab = document.getElementById(tab_id);
	
	if (tab.style.display == 'none') {
	    tab.style.display = 'block';
	} else {
	      tab.style.display = 'none';
	  }

    return false;
}

function displayNone(tab_id) {
	tab = document.getElementById(tab_id);
	tab.style.display = 'none';
}

function popUp(url, width, height, windowName)
{
var str="directories=no,location=no,resizable=no,scrollbars=no,status=no,toolbar=no,width="+width+",height="+height;
	win = window.open(url, windowName, str);
	win.window.focus();
return false;
}