// swap(image string, on boolean)
// name pattern based on/off state swap function
// requires oldswapsrc

var oldswapsrc = new Array();  //required for swap()

function swap(image, on) {
    var img = document.images[image];
	if (on) {
        if (img.src != img.src.replace(/_off/gi, '_over')) {oldswapsrc[image] = img.src;}
		img.src = img.src.replace(/_off/gi, '_over');
	} else {
		if (oldswapsrc[image]) img.src = oldswapsrc[image];
	}
}
    
function changeClass(item, newclass) {
	var cell = document.getElementById(item);
	if (cell != null)
	{
	    cell.className = newclass;
	}
}