find_on = new Image(35,117);
grow_on = new Image(35,117);
intercept_on = new Image(35,117);

find_off = new Image(35,117);
grow_off = new Image(35,117);
intercept_off = new Image(35,117);

find_on = "../img/find_on.gif";
grow_on = "../img/grow_on.gif";
intercept_on = "../img/intercept_on.gif";

find_off = "../img/find.gif";
grow_off = "../img/grow.gif";
intercept_off = "../img/intercept.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(wname,name,h,w) {
	t=10;
	l=10;
	var url = name;
	window.name="pops";
	window.open(url,wname,'width='+w+',height='+h+',top='+t+',left='+l+',status=0,toolbar=0,resizable=0,scrollbars=0');
}