function swapthumb(bld)
{
	restorethumbs();
	idStr = new String();
	idStr = bld;
	num = idStr.charAt(idStr.length-1);

	document[bld].src = eval(bld + "over.src");
	document.mainbuilding.src = eval("mainpic" + num + ".src");
	document.guides.src = eval("guide" + num + ".src");
	document.guides2.src = guides2.src;

	var titlestr = '<p class="pageheading" id="projtitle" align="left">' + eval("projheading" + num) + '</p>';
	var txtel = document.getElementById("maintext");
	txtel.innerHTML = titlestr + eval("projtxt" + num);
}

function restorethumbs()
{
	for(n=1; n<8; n++)
	{
		document["thumb" + n].src = eval("thumb" + n + ".src");
	}
}