function swap(src)
{
    var currCtn = document.getElementById(src.id + "subm");
    if (currCtn) {
	if ((currCtn.style.display == '') || currCtn.style.display == 'none') {
	    currCtn.style.display = 'block';
	}
	else {
	currCtn.style.display = 'none';
	}
    }
}