Fix FF9-Mac for dhtmlxscheduler

dhtmlxscheduler.js

//replace content of _copy_dummy function with the next
scheduler._copy_dummy=function(){ 
    var a = new Date(this.start_date);
    var b = new Date(this.end_date);
    this.start_date = a;
    this.end_date = b;
};

If you are using recurring events, code need to be changed as

//replace content of _copy_dummy function with the next
scheduler._copy_dummy=function(){ 
    var a = new Date(this.start_date);
    var b = new Date(this.end_date);
    this.start_date = a;
    this.end_date = b;

    this.event_length=this.event_pid=this.rec_pattern=this.rec_type=null;
};