/*
 * Controle de validite des dates
 *
 * renvoi true si la date est valide
 */
function checkdate(b,a,c){if(b<1||b>31||a<1||a>12){return false}if(a==2){if(b==30||b==31){return false}if(b==29){return((a%4==0&&a%100!=0)||a%400==0)}}else{if(b==31){return !(a==4||a==6||a==9||a==11)}}return true}function isDateValid(b){var d=b;var a=new RegExp("^([0-9]{2})/([0-9]{2})/([0-9]{4})$");var c=d.match(a);if(c){if(checkdate(c[1],c[2],c[3])){return true}else{return false}}else{return false}};