VanillaJS toogle && changeClass

gistfile1.js

var toggle = function (r,className1) {
	var regex = new RegExp("(?:^|\\s+)" + className1 + "(?:\\s+|$)");
	r.className = (regex.test(r.className)) ? r.className.replace(regex," ") : r.className + ' '+className1;
	return r.className;
};


var changeClass = function (r,className1,className2) {
	var regex = new RegExp("(?:^|\\s+)" + className1 + "(?:\\s+|$)");
	if( regex.test(r.className) ) {
		r.className = r.className.replace(regex,' '+className2+' ');
	}else{
		r.className = r.className.replace(new RegExp("(?:^|\\s+)" + className2 + "(?:\\s+|$)"),' '+className1+' ');
	}
	return r.className;
};