function $() {
    var elems = [];
    for (var i=0; i<arguments.length; i++) {
        var elem = arguments[i];
        if (typeof elem == 'string') elem = document.getElementById(elem);
        if (arguments.length == 1) return elem;
        elems.push(elem);
    }
    return elems;
}

var requirementsSwap = {

	swap : function(switcher, sections, classname, type)
		{
		var c = requirementsSwap;
		var sections = $(sections);
		var reqDivs = sections.getElementsByTagName('div');
		var switcher = $(switcher);
		
		switcher.className = classname;
		
		for(var i=0, div; div=reqDivs[i]; i++) {
			var divId = div.getAttribute('id');
			if(divId == type) {
				div.className = '';
			} else {
				div.className = 'hide';
			}
		}

	}
};