function heatCalc(form) {
var pwr = (form.room.value * form.area.value);
if (pwr==0){
	pwr="";
	}
form.power.value = pwr;
}


function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		heattend_06_over = newImage("images/heattend_06-over.jpg");
		heattend_09_over = newImage("images/heattend_09-over.jpg");
		heattend_18_over = newImage("images/heattend_18-over.jpg");
		heattend_19_over = newImage("images/heattend_19-over.jpg");
		heattend_21_over = newImage("images/heattend_21-over.jpg");
		heattend_22_over = newImage("images/heattend_22-over.jpg");
		heattend_23_over = newImage("images/heattend_23-over.jpg");
		heattend_26_over = newImage("images/heattend_26-over.jpg");
		heattend_27_over = newImage("images/heattend_27-over.jpg");
		heattend_29_over = newImage("images/heattend_29-over.jpg");
		heattend_34_over = newImage("images/heattend_34-over.jpg");
		heattend_35_over = newImage("images/heattend_35-over.jpg");
		heattend_37_over = newImage("images/heattend_37-over.jpg");
		heattend_38_over = newImage("images/heattend_38-over.jpg");
		heattend_42_over = newImage("images/heattend_42-over.jpg");
		heattend_49_over = newImage("images/heattend_49-over.jpg");
		heattend_50_over = newImage("images/heattend_50-over.jpg");
		preloadFlag = true;
	}
}
function MM_goToURL() { //v3.0
  var i, args=MM_goToURL.arguments; document.MM_returnValue = false;
  for (i=0; i<(args.length-1); i+=2) eval(args[i]+".location='"+args[i+1]+"'");
}
// (C) 2000 www.CodeLifter.com
// http://www.codelifter.com
// Set slideShowSpeed (milliseconds)
var slideShowSpeed = 6000
// Duration of crossfade (seconds)
var crossFadeDuration = 2
var Pic = new Array() // don't touch this
Pic[0] = 'images/heattend_01.jpg'
Pic[1] = 'images/home_fade_2.jpg'
Pic[2] = 'images/home_fade_3.jpg'

var t
var j = 0
var p = Pic.length

var preLoad = new Array()
for (i = 0; i < p; i++){
   preLoad[i] = new Image()
   preLoad[i].src = Pic[i]
}

function runSlideShow(){
   if (document.all){
      document.images.SlideShow.style.filter="blendTrans(duration=2)"
      document.images.SlideShow.style.filter="blendTrans(duration=crossFadeDuration)"
      document.images.SlideShow.filters.blendTrans.Apply()      
   }
   document.images.SlideShow.src = preLoad[j].src
   if (document.all){
      document.images.SlideShow.filters.blendTrans.Play()
   }
   j = j + 1
   if (j > (p-1)) j=0
   t = setTimeout('runSlideShow()', slideShowSpeed)
}

<!--          Sandeep V. Tamhankar (stamhankar@hotmail.com) -->
<!-- This script and many more are available free online at -->
<!-- The JavaScript Source!! http://javascript.internet.com -->

function emailCheck (emailStr) {
var emailPat=/^(.+)@(.+)$/
var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"
var validChars="\[^\\s" + specialChars + "\]"
var quotedUser="(\"[^\"]*\")"
var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
var atom=validChars + '+'
var word="(" + atom + "|" + quotedUser + ")"
var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")

var matchArray=emailStr.match(emailPat)
if (matchArray==null) {
	alert("Email address seems incorrect (check @ and .'s)")
	return false
}
var user=matchArray[1]
var domain=matchArray[2]

if (user.match(userPat)==null) {
    // user is not valid
    alert("The e-mail username doesn't seem to be valid.")
    return false
}

var IPArray=domain.match(ipDomainPat)
if (IPArray!=null) {
    // this is an IP address
	  for (var i=1;i<=4;i++) {
	    if (IPArray[i]>255) {
	        alert("Destination IP address is invalid!")
		return false
	    }
    }
    return true
}

var domainArray=domain.match(domainPat)
if (domainArray==null) {
	alert("The e-mail domain doesn't seem to be valid.")
    return false
}

var atomPat=new RegExp(atom,"g")
var domArr=domain.match(atomPat)
var len=domArr.length
if (domArr[domArr.length-1].length<2 || 
    domArr[domArr.length-1].length>3) {
   alert("The e-mail address must end in a three-letter domain, or two letter country.")
   return false
}

if (len<2) {
   var errStr="The e-mail address is missing a hostname!"
   alert(errStr)
   return false
}

return true;
}

function formCheck (form) {

if (form.email.value=="") {
	
	}else{
	if (emailCheck(form.email.value)==false) {
   		return false;
	}
}
return true;
}