JavaScript to get int and String parameter value from URL

/* THIS FUNCTION IS TO FETCH INT PARAMETER VALUES */
function getParametera(param) {
                var val = document.URL;
                var url = val.substr(val.indexOf(param))  
                var n=parseInt(url.replace(param+"=",""));
                alert(n); 
}
getParametera("page");
getParametera("pagee");

/*THIS FUNCTION IS TO FETCH STRING PARAMETER*/
function getParameter(param) {
                var val = document.URL;
                var url = val.substr(val.indexOf(param))  
                var n=url.replace(param+"=","");
                alert(n); 
}
getParameter("str");