document.write("<script language=javascript>");
document.write("function valide(form)");
document.write("{");
document.write("if (form.idlieu.selectedIndex==0)");
document.write("{");
document.write("alert('You have not specified your destination!');");
document.write("return false;");
document.write("}");
document.write("else if (form.dateDepart.selectedIndex==0)");
document.write("{");
document.write("alert('You have not specified the start date of your stay!');");
document.write("return false;");
document.write("}");
document.write("else if (form.nbPersonne.selectedIndex==0)");
document.write("{");
document.write("alert('You have not specified your group size !');");
document.write("return false;");
document.write("}");
document.write("else");
document.write("{");
document.write("return true;");
document.write("}");
document.write("}");
document.write("</script>");

				strStationMes = "You have not specified your destination !"
				strNbMes = "You have not specified your group size !"
				strDatMes = "You have not specified the start date of your stay !"