function changeClass(i,c){
    var old;
    if(document.all) {
        old = document.all(i).className;
        document.all(i).className = c;
    } else if(document.getElementById) {
        old = document.getElementById(i).className;
        document.getElementById(i).className = c;
    }
    return old;
}

function getClassByTagName(t)
{
	if (document.all) {
		return document.all.tags(t)(0).className;
	}
	else if (document.getElementsByTagName)
		return document.getElementsByTagName(t).item(0).getAttribute('class');
	return null;
}