diff --git a/Js/fonctions.js b/Js/fonctions.js
index 2a8d9f8..1c8e067 100755
--- a/Js/fonctions.js
+++ b/Js/fonctions.js
@@ -1568,3 +1568,52 @@ function controle_date_avenant()
   $("#dateAvenant").readable();			
   $("#motifavenant").readable();
 }
+
+$.prototype.enable = function () {
+    $.each(this, function (index, el) {
+        $(el).removeAttr('disabled');
+    });
+}
+
+$.prototype.disable = function () {
+    $.each(this, function (index, el) {
+        $(el).attr('disabled', 'disabled');
+    });
+}
+
+$.prototype.unreadable = function () {
+    $.each(this, function (index, el) {
+        $(el).attr('READONLY', 'READONLY');
+    });
+}
+
+$.prototype.readable = function () {
+    $.each(this, function (index, el) {
+        $(el).removeAttr('READONLY');
+    });
+}
+
+Date.estAnneeBissextile = function (annee) { 
+    return (((annee % 4 === 0) && (annee % 100 !== 0)) || (annee % 400 === 0)); 
+};
+
+Date.getDaysInMonth = function (annee, month) {
+    return [31, (Date.estAnneeBissextile(annee) ? 29 : 28), 31, 30, 31, 30, 31, 31, 30, 31, 30, 31][month];
+};
+
+Date.prototype.estAnneeBissextile = function () { 
+    return Date.estAnneeBissextile(this.getFullYear()); 
+};
+
+Date.prototype.getDaysInMonth = function () { 
+    return Date.getDaysInMonth(this.getFullYear(), this.getMonth());
+};
+
+Date.prototype.addMonths = function (value) {
+    var n = this.getDate();
+    this.setDate(1);
+    this.setMonth(this.getMonth() + value);
+    this.setDate(Math.min(n, this.getDaysInMonth()));
+	this.setDate(this.getDate()-1);
+    return this;
+};