preload('b1on','images/nav/b1o.gif')
preload('b1off','images/nav/b1.gif')
preload('b2on','images/nav/b2o.gif')
preload('b2off','images/nav/b2.gif')
preload('b3on','images/nav/b3o.gif')
preload('b3off','images/nav/b3.gif')
preload('b4on','images/nav/b4o.gif')
preload('b4off','images/nav/b4.gif')
preload('b5on','images/nav/b5o.gif')
preload('b5off','images/nav/b5.gif')
preload('b6on','images/nav/b6o.gif')
preload('b6off','images/nav/b6.gif')
preload('expon','images/expresson.gif')
preload('expoff','images/expressoff.gif')
preload('bookon','images/bookon.gif')
preload('bookoff','images/bookoff.gif')



function preload(imgObj,imgSrc) {
	if (document.images) {
		eval(imgObj+' = new Image()')
		eval(imgObj+'.src = "'+imgSrc+'"')
	}
}

function swapImage(img1, img2){
	if(img2) img1.src = img2.src
}

function printPage()
{
	if(document.getElementById("printSwitch").innerHTML == "Print view")
	{
		hideEl("right")
		hideEl("topright")
		hideEl("nav")
		hideEl("tckr")
		document.getElementById("printSwitch").innerHTML = "Normal view"
		window.print()
	}
	else
	{
		showEl("right")
		showEl("topright")
		showEl("nav")
		showEl("tckr")
		document.getElementById("printSwitch").innerHTML = "Print view"
	}
}
function hideEl(el)
{
	o = document.getElementById(el)
	if(o) o.style.display = "none"
}
function showEl(el)
{
	o = document.getElementById(el)
	if(o) o.style.display = "block"
}