function validar(form) {

if ((form.firstname.value == null) || (form.firstname.value=="")) {
 alert("Please enter your first name");
 form.firstname.focus();
 return false;
}

if ((form.surname.value == null) || (form.surname.value=="")) {
 alert("Please enter your Surname");
 form.surname.focus();
 return false;
}

if (!form.sex[0].checked && !form.sex[1].checked){
 alert("Please select your sex");
 return false;
}

if ((form.email.value == null) || (form.email.value=="") || (form.email.value.indexOf("@") == -1)) {
 alert("Please enter a valid address");
 form.email.focus();
 return false;
}	

op = form.country.selectedIndex;
opcion = form.country.options[op].value;
if (opcion=="Not Select") {
   alert('Please select your country');
   return false;
}

op = form.where.selectedIndex;
opcion = form.where.options[op].value;
if (opcion=="Not Select") {
   alert('Please select a Place');
   return false;
}


if ((form.message.value == null) || (form.message.value=="")) {
 alert("Please enter your message");
 form.message.focus();
 return false;
}

return true;
}



var slideShowSpeed = 3000;
var crossFadeDuration = 3;
var Pic = new Array();

Pic[0]="/images/image1.jpg";
Pic[1]="/images/image2.jpg";
Pic[2]="/images/image3.jpg";
Pic[3]="/images/image4.jpg";
Pic[4]="/images/image5.jpg";
Pic[5]="/images/image6.jpg";
Pic[6]="/images/image7.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);
}