script.js

/**
 * JavaScript Get URL Parameter
 * 
 * @param String prop The specific URL parameter you want to retreive the value for
 * @return String|Object If prop is provided a string value is returned, otherwise an object of all properties is returned
 */
function getUrlParams( prop ) {
    var params = {};
    if(window.location.search.length) {
    		var search = decodeURIComponent( window.location.href.slice( window.location.href.indexOf( '?' ) + 1 ) );
        var definitions = search.split( '&' );

        definitions.forEach( function( val, key ) {
            var parts = val.split( '=', 2 );
            params[ parts[ 0 ] ] = parts[ 1 ];
        } );
    }

    return ( prop && prop in params ) ? params[ prop ] : params;
}