<!--Script d'origine permettant la conversion jusqu'à 3999 a été trouvé sur http://geraud.tardif.free.fr/jsromain.htm-->
<!--Script modifié, étendu aux grands nombres et mis sur cette page par Dr Aly Abbara http://www.aly-abbara.com-->
function intToRom(num)
{
var str = num + "";
var len = str.length;
num = num * 1;
var chf = new Array();
if(!(num < 9000000001 && num > 0)){
  alert('Le chiffre arabe doit être entier et inférieur à 9 000 000 001');
  return false;
}; 
for(i=len-1;i>=0;i--){
  chf[i] = str.charAt(i);
  if(i == len - 1){
    if(chf[i] == 0) chf[i]="";
    if(chf[i] == 1) chf[i]="I";
    if(chf[i] == 2) chf[i]="II";
    if(chf[i] == 3) chf[i]="III";
    if(chf[i] == 4) chf[i]="IV";
    if(chf[i] == 5) chf[i]="V";
    if(chf[i] == 6) chf[i]="VI";
    if(chf[i] == 7) chf[i]="VII";
    if(chf[i] == 8) chf[i]="VIII";
    if(chf[i] == 9) chf[i]="IX";
  }else if(i == len - 2){
    if(chf[i] == 0) chf[i]="";
    if(chf[i] == 1) chf[i]="X";
    if(chf[i] == 2) chf[i]="XX";
    if(chf[i] == 3) chf[i]="XXX";
    if(chf[i] == 4) chf[i]="XL";
    if(chf[i] == 5) chf[i]="L";
    if(chf[i] == 6) chf[i]="LX";
    if(chf[i] == 7) chf[i]="LXX";
    if(chf[i] == 8) chf[i]="LXXX";
    if(chf[i] == 9) chf[i]="XC";
  }else if(i == len - 3){
    if(chf[i] == 0) chf[i]="";
    if(chf[i] == 1) chf[i]="C";
    if(chf[i] == 2) chf[i]="CC";
    if(chf[i] == 3) chf[i]="CCC";
    if(chf[i] == 4) chf[i]="CD";
    if(chf[i] == 5) chf[i]="D";
    if(chf[i] == 6) chf[i]="DC";
    if(chf[i] == 7) chf[i]="DCC";
    if(chf[i] == 8) chf[i]="DCCC";
    if(chf[i] == 9) chf[i]="CM";
  }else if(i == len - 4){
    if(chf[i] == 0) chf[i]="";
    if(chf[i] == 1) chf[i]="M";
    if(chf[i] == 2) chf[i]="MM";
    if(chf[i] == 3) chf[i]="MMM";
    if(chf[i] == 4) chf[i]="MV*";
    if(chf[i] == 5) chf[i]="V*";
    if(chf[i] == 6) chf[i]="V*M";
    if(chf[i] == 7) chf[i]="V*MM";
    if(chf[i] == 8) chf[i]="V*MMM";
    if(chf[i] == 9) chf[i]="MX*";
  }else if(i == len - 5){
    if(chf[i] == 0) chf[i]="";
    if(chf[i] == 1) chf[i]="X*";
    if(chf[i] == 2) chf[i]="X*X*";
    if(chf[i] == 3) chf[i]="X*X*X*";
    if(chf[i] == 4) chf[i]="X*L*";
    if(chf[i] == 5) chf[i]="L*";
    if(chf[i] == 6) chf[i]="L*X*";
    if(chf[i] == 7) chf[i]="L*X*X*";
    if(chf[i] == 8) chf[i]="L*X*X*X*";
    if(chf[i] == 9) chf[i]="X*C*";
  }else if(i == len - 6){
    if(chf[i] == 0) chf[i]="";
    if(chf[i] == 1) chf[i]="C*";
    if(chf[i] == 2) chf[i]="C*C*";
    if(chf[i] == 3) chf[i]="C*C*C*";
    if(chf[i] == 4) chf[i]="C*D*";
    if(chf[i] == 5) chf[i]="D*";
    if(chf[i] == 6) chf[i]="D*C*";
    if(chf[i] == 7) chf[i]="D*C*C*";
    if(chf[i] == 8) chf[i]="D*C*C*C*";
    if(chf[i] == 9) chf[i]="C*I**";
  }else if(i == len - 7){
    if(chf[i] == 0) chf[i]="";
    if(chf[i] == 1) chf[i]="I**";
    if(chf[i] == 2) chf[i]="I**I**";
    if(chf[i] == 3) chf[i]="I**I**I**";
    if(chf[i] == 4) chf[i]="I**V**";
    if(chf[i] == 5) chf[i]="V**";
    if(chf[i] == 6) chf[i]="V**I**";
    if(chf[i] == 7) chf[i]="V**I**I**";
    if(chf[i] == 8) chf[i]="V**I**I**I**";
    if(chf[i] == 9) chf[i]="I**X**";
  }else if(i == len - 8){
    if(chf[i] == 0) chf[i]="";
    if(chf[i] == 1) chf[i]="X**";
    if(chf[i] == 2) chf[i]="X**X**";
    if(chf[i] == 3) chf[i]="X**X**X**";
    if(chf[i] == 4) chf[i]="X**L**";
    if(chf[i] == 5) chf[i]="L**";
    if(chf[i] == 6) chf[i]="L**X**";
    if(chf[i] == 7) chf[i]="L**X**X**";
    if(chf[i] == 8) chf[i]="L**X**X**X**";
    if(chf[i] == 9) chf[i]="X**C**";
  }else if(i == len - 9){
    if(chf[i] == 0) chf[i]="";
    if(chf[i] == 1) chf[i]="C**";
    if(chf[i] == 2) chf[i]="C**C**";
    if(chf[i] == 3) chf[i]="C**C**C**";
    if(chf[i] == 4) chf[i]="C**D**";
    if(chf[i] == 5) chf[i]="D**";
    if(chf[i] == 6) chf[i]="D**C**";
    if(chf[i] == 7) chf[i]="D**C**C**";
    if(chf[i] == 8) chf[i]="D**C**C**C**";
    if(chf[i] == 9) chf[i]="C**I***";
  }else if(i == len - 10){
    if(chf[i] == 0) chf[i]="";
    if(chf[i] == 1) chf[i]="I***";
    if(chf[i] == 2) chf[i]="I***I***";
    if(chf[i] == 3) chf[i]="I***I***I***";
    if(chf[i] == 4) chf[i]="I***V***";
    if(chf[i] == 5) chf[i]="V***";
    if(chf[i] == 6) chf[i]="V***I***";
    if(chf[i] == 7) chf[i]="V***I***I***";
    if(chf[i] == 8) chf[i]="V***I***I***I***";
    if(chf[i] == 9) chf[i]="I***X***"; 
  }; 
}
return(chf.join(""));
}
function romToInt(rom)
{
rom += "";
rom = rom.toUpperCase();
for(inc=1;inc<50001;inc++){
  if(rom == intToRom(inc)) return inc;
}
alert('Le chiffre romain doit être compris entre I et L* et sa composition doit êrte correcte');
return false;
}