function signs() {
var start = 1901, jour=document.signe.jour.value, mois=document.signe.mois.selectedIndex;
with (document.signe.sign){
if (mois == 1 && jour >=20 || mois == 2 && jour <=18) {value = "Verseau";}
if (mois == 1 && jour > 31) {value = "Date invalide";}
if (mois == 2 && jour >=19 || mois == 3 && jour <=20) {value = "Poissons";}
if (mois == 2 && jour > 29) {value = "Date invalide";}
if (mois == 3 && jour >=21 || mois == 4 && jour <=19) {value = "Bélier";}
if (mois == 3 && jour > 31) {value = "Date invalide";}
if (mois == 4 && jour >=20 || mois == 5 && jour <=20) {value = "Taureau";}
if (mois == 4 && jour > 30) {value = "Je suis vraiment désolé !";}
if (mois == 5 && jour >=21 || mois == 6 && jour <=21) {value = "Gémeaux";}
if (mois == 5 && jour > 31) {value = "Date invalide";}
if (mois == 6 && jour >=22 || mois == 7 && jour <=22) {value = "Cancer";}
if (mois == 6 && jour > 30) {value = "Date invalide";}
if (mois == 7 && jour >=23 || mois == 8 && jour <=22) {value = "Lion";}
if (mois == 7 && jour > 31) {value = "Date invalide";}
if (mois == 8 && jour >=23 || mois == 9 && jour <=22) {value = "Vierge";}
if (mois == 8 && jour > 31) {value = "Date invalide";}
if (mois == 9 && jour >=23 || mois == 10 && jour <=22) {value = "Balance";}
if (mois == 9 && jour > 30) {value = "Date invalide";}
if (mois == 10 && jour >=23 || mois == 11 && jour <=21) {value = "Scorpion";}
if (mois == 10 && jour > 31) {value = "Date invalide";}
if (mois == 11 && jour >=22 || mois == 12 && jour <=21) {value = "Sagittaire";}
if (mois == 11 && jour > 30) {value = "Date invalide";}
if (mois == 12 && jour >=22 || mois == 1 && jour <=19) {value = "Capricorne";}
if (mois == 12 && jour > 31) {value = "Date invalide";}}}