function cleanInput(obj, string) {
	if($(obj).val() == string) {
		$(obj).val('');
	}
}

function is_array(input){
    return typeof(input)=='object'&&(input instanceof Array);
}

Array.prototype.foreach = function( callback ) {
	for( var k=0; k<this .length; k++ ) {
		callback( k, this[ k ] );
	}
}