function imgPlain(thisImg) {
	document[thisImg].src = "images/play-" + thisImg + "-black.gif"
}

function imgGreen(thisImg) {
	document[thisImg].src = "images/play-" + thisImg + "-green.gif"
}

function linkBlack(thisLink) {
	document[thisLink].src = "images/link-" + thisLink + "-black.gif"
}

function linkGreen(thisLink) {
	document[thisLink].src = "images/link-" + thisLink + "-green.gif"
}

function linkBlack2(thisLink) {
	document[thisLink].src = "images/link2-" + thisLink + "-black.gif"
}

function linkGreen2(thisLink) {
	document[thisLink].src = "images/link2-" + thisLink + "-green.gif"
}