// Highlight form element- © Dynamic Drive (www.dynamicdrive.com)
// For full source code, 100's more DHTML scripts, and TOS,
// visit http://www.dynamicdrive.com

var highlightcolor = "lightyellow"

var ns6 = document.getElementById && !document.all
var previous = ''
var eventobj

// Regular expression to highlight only form elements
var intended = /INPUT|TEXTAREA|SELECT|OPTION/

// Function to check whether element clicked is form element
function checkel(which) {
	if (which.style && intended.test(which.tagName)) {
		if (ns6 && eventobj.nodeType == 3)
			eventobj = eventobj.parentNode.parentNode
		return true
	} else
		return false
}

// Function to highlight form element
function highlight(e) {
	eventobj = ns6 ? e.target : event.srcElement
	if (previous != '') {
		if (checkel(previous))
			previous.style.backgroundColor = ''
		previous = eventobj
		if (checkel(eventobj))
			eventobj.style.backgroundColor = highlightcolor
	} else {
		if (checkel(eventobj))
			eventobj.style.backgroundColor = highlightcolor
		previous = eventobj
	}
}