createStyleSheet.js

if(typeof document.createStyleSheet === 'undefined') {
	document.createStyleSheet = (function() {
			function createStyleSheet(href) {
			if(typeof href !== 'undefined') {
			var element = document.createElement('link');
			element.type = 'text/css';
			element.rel = 'stylesheet';
			element.href = href;
			}
			else {
			var element = document.createElement('style');
			element.type = 'text/css';
			}

			document.getElementsByTagName('head')[0].appendChild(element);
			var sheet = document.styleSheets[document.styleSheets.length - 1];

			if(typeof sheet.addRule === 'undefined')
			sheet.addRule = addRule;

			if(typeof sheet.removeRule === 'undefined')
			sheet.removeRule = sheet.deleteRule;

			return sheet;
			}

			function addRule(selectorText, cssText, index) {
				if(typeof index === 'undefined')
					index = this.cssRules.length;

				this.insertRule(selectorText + ' {' + cssText + '}', index);
				}

				return createStyleSheet;
			})();
	}