a1=new Image(45,45)
	a1.src="images/index-nav-off_01.jpg"
	a2=new Image(45,45)
	a2.src="images/index-nav-on_01.jpg"
	
	b1=new Image(45,45)
	b1.src="images/index-nav-off_02.jpg"
	b2=new Image(45,45)
	b2.src="images/index-nav-on_02.jpg"
	
	c1=new Image(45,45)
	c1.src="images/index-nav-off_03.jpg"
	c2=new Image(45,45)
	c2.src="images/index-nav-on_03.jpg"
	
	function filter(imagename,objectsrc){
	if (document.images)
	document.images[imagename].src=eval(objectsrc+".src")
	}