function changeImages() {

	 for (var i=0; i<changeImages.arguments.length; i+=2) {
	 document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
	 }
}	

function showpdf(x) {
	var mytemp = x.firstChild.src;
	x.firstChild.src = x.parentNode.parentNode.lastChild.firstChild.firstChild.src;
	x.parentNode.parentNode.lastChild.firstChild.firstChild.src = mytemp;
}