if (document.images){
	bestpractices_off=new Image
	bestpractices_on=new Image
	planning_off=new Image
	planning_on=new Image
	libraryweb_off=new Image
	libraryweb_on=new Image
	aboutdpg_off=new Image
	aboutdpg_on=new Image
		
	bestpractices_off.src="images/index/bestpractices_off.gif"
	bestpractices_on.src="images/index/bestpractices_on.gif"
	planning_off.src="images/index/planning_off.gif"
	planning_on.src="images/index/planning_on.gif"
	libraryweb_off.src="images/index/libraryweb_off.gif"
	libraryweb_on.src="images/index/libraryweb_on.gif"
	aboutdpg_off.src="images/index/aboutdpg_off.gif"
	aboutdpg_on.src="images/index/aboutdpg_on.gif"
	
}

function chgImg(imgField,newImg){
	if (document.images){
		document[imgField].src=eval(newImg+".src")
	}
	
}