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function getQueryVariable(variable)
{
       var query = window.location.search.substring(1);
       var vars = query.split("&");
       for (var i=0;i<vars.length;i++) {
               var pair = vars[i].split("=");
               if(pair[0] == variable){return pair[1];}
       }
       return(false);
}

var varValue = getQueryVariable("dev");
//EG
// http://www.chris-ridley.co.uk/sl-dev/09-devURL-storyline/story.html?dev=A
// will return A