(function ()  
{   var ie = !!(window.attachEvent && !window.opera); 
    var wk = /webkit//(/d+)/i.test(navigator.userAgent) && (RegExp.$1 < 525); 
    var fn = [];  
    var run = function () 
                {  
                    for (var i = 0; i < fn.length; i++) fn[i]();  
                };  
    var d = document;  
    d.ready = function (f)  
                {  
                    if (!ie && !wk && d.addEventListener)  
                    return d.addEventListener('DOMContentLoaded', f, false);  
                    if (fn.push(f) > 1) return;  
                    if (ie) (function ()  
                                {  
                                    try {  
                                            d.documentElement.doScroll('left');  
                                            run();  
                                        }  
                                    catch (err)  
                                        {  
                                            setTimeout(arguments.callee, 0);  
                                        }  
                                } 
                            )();  
                    else if (wk)   
                    var t = setInterval(function ()  
                                        {   
                                            if (/^(loaded|complete)$/.test(d.readyState))  
                                            clearInterval(t), run();   
                                        }, 0);  
                };  
})();   
 
//usage 
document.ready(function(){check_radio();});