function checkKeycode(stReturn) {
var stReturn  = (stReturn) ? stReturn:((event) ? event : null);
var stClearRadio = (stReturn.target) ? stReturn.target:((stReturn.srcElement) ? stReturn.srcElement : null);
if ((stReturn.keyCode == 13) && (stClearRadio.type=="radio"))
return false;
var stClearText = (stReturn.target) ? stReturn.target:((stReturn.srcElement) ? stReturn.srcElement : null);
if ((stReturn.keyCode == 13) && (stClearText.type=="text"))
return false;
}
document.onkeypress = checkKeycode;