javascript+how to create properties and get whether element is check or not

 document.onkeydown = myKeyDownHandler;

 function
myKeyDownHandler(e){
if(event.keyCode==13 ){alert(document.getElementById(‘<%=btnInsertRow.ClientID %>’).hasFocus);document.getElementById( ‘<%=btnInsertRow.ClientID %>’).focus();

window.onload = function() {
for (i=0; i<form.elements.length-1; i++) {
   elem = document.forms['quick_reply'].elements[i];
   elem.focused = false;
   elem.hasFocus = function() {
      return this.focused;
   };
   elem.onfocus=function() {
      this.focused=true;
   };
   elem.onblur=function() {
      this.focused=false;
   };
}
}

<style type=”text/css”>
input, select, textarea, label, button {
   background-color: #FFF;
}
input:focus, select:focus, textarea:focus, label:focus, button:focus {
   background-color: #FEFEFE;
}
</style>