Function to check for and return the values of URL parameters.

getURLParameter.js

// Get URL parameters
function getURLParameter(name) {
	name = name.replace(/[\[]/,"\\[").replace(/[\]]/,"\\]");

	var regexS = "[\\?&]"+name+"=([^&#]*)",
		regex = new RegExp( regexS ),
		results = regex.exec( window.location.href )
	;

	if( results === null ) {
		return '';
	}
	else {
		return results[1];
	}
}

getURLParameter.min.js

function getURLParameter(a){a=a.replace(/[\[]/,"\\[").replace(/[\]]/,"\\]");var b="[\\?&]"+a+"=([^&#]*)",c=new RegExp(b),d=c.exec(window.location.href);return null===d?"":d[1]}