function checkAndResolveRelativeUrl(sUrl, sThemeBaseUrl) {
			var aMatch = rCssUrl.exec(sUrl);
			if (aMatch) {
				var oUri = new URI(aMatch[1]);
				if (oUri.is("relative")) {
					// Rewrite relative URLs based on the theme base url
					// Otherwise they would be relative to the HTML page which is incorrect
					var sNormalizedUrl = oUri.absoluteTo(sThemeBaseUrl).normalize().toString();
					sUrl = "url('" + sNormalizedUrl + "')";
				}
			}

			return sUrl;
		}
Resolves relative URLs in parameter values.
Only for inline-parameters.

Parameters containing CSS URLs will automatically be resolved to the theme-specific location they originate from.

Example:
A parameter for the "sap_horizon" theme will be resolved to a libraries "[library path...]/themes/sap_horizon" folder.
Relative URLs can resolve backwards, too, so given the sample above, a parameter value of <code>url('../my_logo.jpeg')</code>
will resolve to the "[library path...]/themes" folder.

@param {string} sUrl the relative URL to resolve
@param {string} sThemeBaseUrl the theme base URL, pointing to the library that contains the parameter
@returns {string} the resolved URL in CSS URL notation