img1a_on = new Image(31,160);
img2a_on = new Image(31,160);
img3a_on = new Image(31,160);
img4a_on = new Image(31,160);
img5a_on = new Image(31,160);

img1a_off = new Image(31,160);
img2a_off = new Image(31,160);
img3a_off = new Image(31,160);
img4a_off = new Image(31,160);
img5a_off = new Image(31,160);

img1a_on = "../img/nav/menu_1a_on.gif";
img2a_on = "../img/nav/menu_2a_on.gif";
img3a_on = "../img/nav/menu_3a_on.gif";
img4a_on = "../img/nav/menu_4a_on.gif";
img5a_on = "../img/nav/menu_5a_on.gif";

img1a_off = "../img/nav/menu_1a_off.gif";
img2a_off = "../img/nav/menu_2a_off.gif";
img3a_off = "../img/nav/menu_3a_off.gif";
img4a_off = "../img/nav/menu_4a_off.gif";
img5a_off = "../img/nav/menu_5a_off.gif";

//functions to swap img
function push(imgName) {
    if (document.images)
      document[imgName].src = eval(imgName + '_on');  
}
function release(imgName) {
  if (document.images)
    document[imgName].src = eval(imgName + '_off');  
}

function popwin(wintype,title,w,h) {
	SmallWin=window.open(wintype,title,"toolbar=no,directories=no,status=no,scrollbars=no,menubar=no,width=" + w + ",height=" + h + ",resizable=no"); 
	SmallWin.window.focus();
}