// JavaScript Document
         function slide() { 
            var menu=document.getElementById('menu'); 
            var count=menu.getElementsByTagName('LI'); 
            var countin,i,k,tname; 

            for(i=0; i<count.length; i++) { 
               countin=count[i].childNodes.length; 
               for(k=0; k<countin; k++) { 
                  tname=count[i].childNodes[k].tagName; 
                  if(tname=='UL') { 
                     count[i].onmouseover=function() { 
                        this.childNodes[2].style.display='block'; 
                     } 
                     count[i].onmouseout=function() { 
                        this.childNodes[2].style.display='none'; 
                     } 
                  } 
               } 
            } 
         } 
         window.onload=slide;

function check(){

var first_name = document.form.first_name.value;
var last_name = document.form.last_name.value;
var uni = document.form.uni.value;
var e_mail = document.form.e_mail.value;
var func = document.form.func.value;
var address = document.form.address.value;
var city = document.form.city.value;
var post_code = document.form.post_code.value;
var country = document.form.country.value;
var phone = document.form.phone.value;
var gender_f = document.form.gender_f.checked;
var gender_m = document.form.gender_m.checked;
var sport_activities = document.form.sport_activities.value;
var t_sh_size = document.form.t_sh_size.value;

if(!first_name) {
alert('Please insert a first name');
return false;
}
if(!last_name) {
alert('Please insert a last name');
return false;
}
if(!uni) {
alert('Please insert an University/Institution/Organization');
return false;
}
if(!e_mail){
alert('Please insert an e-mail address');
return false;
}
if(!func){
alert('Please insert a Function/Position');
return false;
}
if(!address) {
alert('Please insert an address');
return false;
}
if(!city) {
alert('Please insert an city');
return false;
}
if(!post_code) {
alert('Please insert a post code');
return false;
}
if(!country) {
alert('Please insert a country');
return false;
}
if(!phone) {
alert('Please insert a phone number');
return false;
}
if(!gender_f && !gender_m) {
alert('Please tick a gender');
return false;
}
if(!sport_activities) {
alert('Please insert Sport activities');
return false;
}
if(!t_sh_size) {
alert('Please insert T-shirt size');
return false;
}
}