IE8 compatibility issue with Jquery.validate.js

Just find

return $([]).add(this.currentForm.elements).filter(":input")

in the jquery.validate.js file

near line 446 and replace it with

var listeElements = new Array();
 for(var k=0;k<this.currentForm.elements.length;k++){
 listeElements[k] = this.currentForm.elements[k];
 }
 return $([]).add(listeElements).filter(":input")