function transcrire() {

var car = document.conversion.saisie.value;

car = car.replace(/a1/g, "ā");
car = car.replace(/a2/g, "á");
car = car.replace(/a3/g, "ǎ");
car = car.replace(/a4/g, "à"); 
car = car.replace(/e1/g, "ē");
car = car.replace(/e2/g, "é");
car = car.replace(/e3/g, "ě");
car = car.replace(/e4/g, "è");     
car = car.replace(/i1/g, "ī");
car = car.replace(/i2/g, "í");
car = car.replace(/i3/g, "ǐ");
car = car.replace(/i4/g, "ì"); 
car = car.replace(/o1/g, "ō");           
car = car.replace(/o2/g, "ó");
car = car.replace(/o3/g, "ǒ");
car = car.replace(/o4/g, "ò");
car = car.replace(/u1/g, "ū");
car = car.replace(/u2/g, "ú");
car = car.replace(/u3/g, "ǔ");
car = car.replace(/u4/g, "ù"); 
car = car.replace(/ü1/g, "ǖ");     
car = car.replace(/ü2/g, "ǘ");
car = car.replace(/ü3/g, "ǚ");
car = car.replace(/ü4/g, "ǜ"); 
car = car.replace(/an1/g, "ān");
car = car.replace(/an2/g, "án");
car = car.replace(/an3/g, "ǎn");
car = car.replace(/an4/g, "àn");
car = car.replace(/ang1/g, "āng");
car = car.replace(/ang2/g, "áng");
car = car.replace(/ang3/g, "ǎng");
car = car.replace(/ang4/g, "àng");
car = car.replace(/en1/g, "ēn");
car = car.replace(/en2/g, "én");
car = car.replace(/en3/g, "ěn");
car = car.replace(/en4/g, "èn");
car = car.replace(/eng1/g, "ēng");
car = car.replace(/eng2/g, "éng");
car = car.replace(/eng3/g, "ěng");
car = car.replace(/eng4/g, "èng");
car = car.replace(/in1/g, "īn");
car = car.replace(/in2/g, "ín");
car = car.replace(/in3/g, "ǐn");
car = car.replace(/in4/g, "ìn"); 
car = car.replace(/ong1/g, "ōng");
car = car.replace(/ong2/g, "óng");
car = car.replace(/ong3/g, "ǒng");
car = car.replace(/ong4/g, "òng");
car = car.replace(/un1/g, "ūn");
car = car.replace(/un2/g, "ún");
car = car.replace(/un3/g, "ǔn");
car = car.replace(/un4/g, "ùn"); 
car = car.replace(/er2/g, "ér");
car = car.replace(/er3/g, "ěr");
car = car.replace(/er4/g, "èr");
car = car.replace(/aō/g, "āo");           
car = car.replace(/aó/g, "áo");
car = car.replace(/aǒ/g, "ǎo");
car = car.replace(/aò/g, "ào");
car = car.replace(/oū/g, "ōu");           
car = car.replace(/oú/g, "óu");
car = car.replace(/oǔ/g, "ǒu");
car = car.replace(/où/g, "òu");
car = car.replace(/aī/g, "āi");
car = car.replace(/aí/g, "ái");
car = car.replace(/aǐ/g, "ǎi");
car = car.replace(/aì/g, "ài"); 
car = car.replace(/eī/g, "ēi");
car = car.replace(/eí/g, "éi");
car = car.replace(/eǐ/g, "ěi");
car = car.replace(/eī/g, "èi");

document.conversion.saisie.value=car;

}