Javascript: Check the form element

javascript.js

function form_check_any_modity()
{
    var form = document.forms[0];

    for (var i=0; i<form.elements.length; i++)
    {
	var element = form.elements[i];
	var type = element.type;
	//alert("type="+type);
	//alert("element.disabled="+element.disabled);
	if (element.disabled == true) continue;

	if (type == "text")
	{
	    alert("text type, value="+element.value+",defaultValue="+element.defaultValue);
	    if (element.value != element.defaultValue)
	    {
		alert("["+x+"]text type, value="+element.value+",defaultValue="+element.defaultValue);
	        break;
	    }
	}
	else if (type == "radio" || type == "checkbox")
	{
	    alert("readio type or checkbox type, checked="+element.checked+",defaultChecked="+element.defaultChecked);
	    if (element.checked != element.defaultChecked)
	    {
		alert("["+x+"]readio type or checkbox type, checked="+element.checked+",defaultChecked="+element.defaultChecked);
		break;
	    }
	}
	else if (type == "select-one" || type == "select-multiple")
	{
	    alert("select type, value="+element.value+",defaultValue="+element.defaultValue);
	    for (var j=0; j<element.options.length; j++)
	    {
		alert("select type no="+j+", selected="+element.options[j].selected+",defaultSelected="+element.options[j].defaultSelected);
		if (element.options[j].selected != element.options[j].defaultSelected)
		{
		    alert("["+x+"]select type no="+j+", selected="+element.options[j].selected+",defaultSelected="+element.options[j].defaultSelected);
		    break;
		}
	    }
	}
    }
}