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JavaScript

function getURLParameter(name, urlsearch) {

		return decodeURIComponent((new RegExp('[?|&]' + name + '=' + '([^&;]+?)(&|#|;|$)').exec(urlsearch||location.search) || [ , "" ])[1]
				.replace(/\+/g, '%20'))
				|| null;
	}


var url  ="Posts?Category=1134324";;

alert(getURLParameter('Category', url));