function replaceSubstring(inputString, fromString, toString) {
   // Goes through the inputString and replaces every occurrence of fromString with toString
   var temp = inputString;
   if (fromString == "") {
      return inputString;
   }
   if (toString.indexOf(fromString) == -1) { // If the string being replaced is not a part of the replacement string (normal situation)
      while (temp.indexOf(fromString) != -1) {
         var toTheLeft = temp.substring(0, temp.indexOf(fromString));
         var toTheRight = temp.substring(temp.indexOf(fromString)+fromString.length, temp.length);
         temp = toTheLeft + toString + toTheRight;
      }
   } else { // String being replaced is part of replacement string (like "+" being replaced with "++") - prevent an infinite loop
      var midStrings = new Array("~", "`", "_", "^", "#");
      var midStringLen = 1;
      var midString = "";
      // Find a string that doesn't exist in the inputString to be used
      // as an "inbetween" string
      while (midString == "") {
         for (var i=0; i < midStrings.length; i++) {
            var tempMidString = "";
            for (var j=0; j < midStringLen; j++) { tempMidString += midStrings[i]; }
            if (fromString.indexOf(tempMidString) == -1) {
               midString = tempMidString;
               i = midStrings.length + 1;
            }
         }
      } // Keep on going until we build an "inbetween" string that doesn't exist
      // Now go through and do two replaces - first, replace the "fromString" with the "inbetween" string
      while (temp.indexOf(fromString) != -1) {
         var toTheLeft = temp.substring(0, temp.indexOf(fromString));
         var toTheRight = temp.substring(temp.indexOf(fromString)+fromString.length, temp.length);
         temp = toTheLeft + midString + toTheRight;
      }
      // Next, replace the "inbetween" string with the "toString"
      while (temp.indexOf(midString) != -1) {
         var toTheLeft = temp.substring(0, temp.indexOf(midString));
         var toTheRight = temp.substring(temp.indexOf(midString)+midString.length, temp.length);
         temp = toTheLeft + toString + toTheRight;
      }
   } // Ends the check to see if the string being replaced is part of the replacement string or not
   return temp; // Send the updated string back to the user
} // Ends the "replaceSubstring" function


function verif() {


// Vérification du mensualité 
if (document.form.MensualitePret.value == 0) {
	alert('Veuillez remplir le montant de votre mensualité !');
	document.form.MensualitePret.focus();
	return false
};

// Vérification du taux
if (document.form.Taux.value == 0) {
	alert('Veuillez remplir le taux de votre crédit !');
	document.form.Taux.focus();
	return false
};
}

function tauxpourannee() {
 var a=document.form.Annee.options[document.form.Annee.selectedIndex].text;
 a=eval("document.form.TauxInteret"+a+".value");
   document.form.Taux.value=a;
}

function mensualitepourevenu() {
var a=document.form.Revenu.value;
a=replaceSubstring(a, " ", "");
var b=document.form.Charge.value;
b=replaceSubstring(b, " ", "");
c=parseFloat(a/(a-b));
if ((Math.abs(c))>1.49){
	alert('Avec vos charges, vous dépassez la capacité d\'endettement autorisée par les banques !');
} else {
document.form.MensualitePret.value=parseInt((a*.3301)-b);
};
}