li1on = new Image();          
li1on.src = "images/yarrow.gif";    

li1off = new Image();         
li1off.src = "images/clear.gif";  

                         
function img_act(imgName) {

     imgOn = li1on.src;
     document [imgName].src = imgOn;

}

function img_inact(imgName) {

     imgOff = li1off.src;
     document [imgName].src = imgOff;
}

var windowHandle = ""; // make global variable
function myOpen(url, mywidth, myheight) {
    options = "toolbar=0,status=0,menubar=0,scrollbars=0,resizable=1";
	mywindow = "_new";

    windowHandle = window.open(url, mywindow, options + ',width=' + mywidth + ', height=' + myheight);
	windowHandle.innerHeight = myheight;
    windowHandle.innerWidth = mywidth;
    if (window.focus) setTimeout('windowHandle.focus()', 500);
}