Mere Javascript Code

if (!this.mere) {var mere = {}}

mere.dom = {
   classRegex: function(className) {
      return new RegExp("(\\s|^)" + className + "(\\s|$)");
   },

   hasClass: function(element, className) {
      if (!element) { return; }
      var reg = this.classRegex(className);
      return element.className.match(reg);
   },

   addClass: function(element, className) {
      if (!element) { return; }
      if (this.hasClass(element, className)) { return; }
      var newClasses = element.className + ' ' + className;
      element.className = this.trim(newClasses);
   },

   removeClass: function(element, className) {
      if (this.hasClass(element, className)) {
         var reg = this.classRegex(className);
         var newClasses = element.className.replace(reg, ' ');
         element.className = this.trim(newClasses);
      }
   },

   //duplicated from str.js
	trim: function(str) {
		return str.replace(/^\s*|\s*$/g,"")
	},
}