// JavaScript Document
// script that highlights textfields in focus

// 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 unhighlight="white"

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
}
}

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