function initPage() {
    var url = window.location.href;
    var form = document.getElementById("form");
    if(strpos(url, "emptymail")) alert("Please provide your email address.");
    if(form){
        if(strpos(url, "sent"))  form.innerHTML = "<h2>send message</h2><form class=\"send-form\"><fieldset><div class=\"row-head\"><label for=\"subscribe-check\">THANK YOU!</label></div></fieldset></form>";
        else if(strpos(url, "error"))  form.innerHTML = "<h2>Some error occured.</h2>";
    }
}

function strpos (haystack, needle, offset) {
    var i = (haystack+'').indexOf(needle, (offset ? offset : 0));
    return i === -1 ? false : i;
}

if (window.addEventListener)
	window.addEventListener("load", initPage, false);
else if (window.attachEvent)
	window.attachEvent("onload", initPage);