function CheckForm(theform)
{
if (theform.nom_de_famille.value=='')
	{
		alert('Please enter your surname');
		theform.nom_de_famille.focus();
		return false;
	}
	if (theform.prenom.value=='')
	{
		alert('Please enter your name');
		theform.prenom.focus();
		return false;
	}
	if (theform.adresse.value=='')
	{
		alert('Please enter your address');
		theform.adresse.focus();
		return false;
	}
	if (theform.pays.value=='select')
	{
		alert('Please select your country');
		theform.pays.focus();
		return false;
	}
	if (theform.email.value=='' && theform.fax.value=='')
	{
		alert('Please enter your fax number or your e-mail')
		theform.email.focus();
		return false
	}
	if (theform.nombre_de_personnes.value=='')
	{
		alert('Please enter the number of person(s)');
		theform.nombre_de_personnes.focus();
		return false;
	}
	if (theform.periode_du.value=='')
	{
		alert('Please enter the date of beginning');
		theform.periode_du.focus();
		return false;
	}
	if (theform.au.value=='')
	{
		alert('Please enter the date of end');
		theform.au.focus();
		return false;
	}
	if (theform.simple_standard.value=='' && theform.simple_superieure.value=='' && theform.double_standard.value=='' && theform.double_superieure.value=='' && theform.suite.value=='')
	{
		alert('Please enter the number of room(s)');
		theform.simple_standard.focus();
		return false;
	}
	
		return true;
}