rjs/xcss.js
function (css, name) {
				if (typeof css === "function") { css = css(); }
				if (!css) { return; }
				if (!name) {
					_includeCSSInternal(css);
				} else if (!_stylesheetFiles[name]) {
					_includeCSSInternal(css);
					_stylesheetFiles[name] = true;
				}
			}
function (css, name) {
				if (typeof css === "function") { css = css(); }
				if (!css) { return; }
				if (!name) {
					_includeCSSInternal(css);
				} else if (!_stylesheetFiles[name]) {
					_includeCSSInternal(css);
					_stylesheetFiles[name] = true;
				}
			}
function ( css , name ) { if ( typeof css === "function" ) { css = css ( ) ; } if ( ! css ) { return ; } if ( ! name ) { _includeCSSInternal ( css ) ; } else if ( ! _stylesheetFiles [ name ] ) { _includeCSSInternal ( css ) ; _stylesheetFiles [ name ] = true ; } }
Append style element with css param's content
@param {String|Function} css Content for style element or a function which returns it
@param {String} name Name of the stylesheet to prevent duplication.
Append style element with css param s content