a1=new Image(45,45)
	a1.src="images/sub-nav_01.gif"
	a2=new Image(45,45)
	a2.src="images/sub-nav-on_01.gif"
	
	b1=new Image(45,45)
	b1.src="images/sub-nav_02.gif"
	b2=new Image(45,45)
	b2.src="images/sub-nav-on_02.gif"

	c1=new Image(45,45)
	c1.src="images/sub-nav_03.gif"
	c2=new Image(45,45)
	c2.src="images/sub-nav-on_03.gif"
	
	d1=new Image(45,45)
	d1.src="images/sub-nava_01.gif"
	d2=new Image(45,45)
	d2.src="images/sub-nava-on_01.gif"
	
	e1=new Image(45,45)
	e1.src="images/sub-nava_02.gif"
	e2=new Image(45,45)
	e2.src="images/sub-nava-on_02.gif"
	
	
	function filter(imagename,objectsrc){
	if (document.images)
	document.images[imagename].src=eval(objectsrc+".src")
	}