dhtmlXCombo.prototype.attachChildCombo = function(_chcombo,xml){
	if(!this._child_combos){
		this._child_combos = [];
	}
	
	this._has_childen = 1;
	
	this._child_combos[this._child_combos.length] = _chcombo;
	
	_chcombo.show(0);
	
	var that = this;
	var _arg_length = arguments.length;
	
	this.attachEvent("onChange",function(){
		for(var i = 0; i < that._child_combos.length; i++){
		
			if(that._child_combos[i]==_chcombo){
				_chcombo.show(1);
				_chcombo.callEvent("onMasterChange",[that.getActualValue(),that]);
			}
		
		}
		
		if(that.getActualValue()=="") { 
			that.showSubCombo(that,0);
			return;
		}
		
			if(_chcombo._xml){
				if(_arg_length ==1) xml = _chcombo._xml;  
				_chcombo._xml = that.deleteParentVariable(xml)+((_chcombo._xml.indexOf("?")!=-1)?"&":"?")+"parent="+that.getActualValue();			
			}
			else{
				if(xml){
					_chcombo.clearAll(true);
					xml = that.deleteParentVariable(xml) +((xml.indexOf("?")!=-1)?"&":"?")+"parent="+that.getActualValue();		
					_chcombo.loadXML(xml);
				}
				
			}
	})
}

dhtmlXCombo.prototype.setAutoSubCombo = function(xml,name){
	if(arguments.length == 1) name = "subcombo";
	if(!this._parentCombo){ 
		var z = new dhtmlXCombo(this.DOMParent,name,this.DOMelem.style.width)
		z._parentCombo  = this;
	} 
	else {
		var z = new dhtmlXCombo(this._parentCombo.DOMParent,name,this._parentCombo.DOMelem.style.width)
		z._parentCombo = this._parentCombo;
	}
	if(this._filter) z._filter = 1;
	if(this._xml){
		if(arguments.length > 0) 
			z._xml = xml;
		else  
			z._xml = this._xml;
		xml = z._xml;
        z._autoxml = this._autoxml;
		if(this._xmlCache) z._xmlCache=[];
     }
	
	this.attachChildCombo(z,xml)	
	return z;
}

dhtmlXCombo.prototype.detachChildCombo = function(_chcombo){
	for(var i = 0; i < this._child_combos.length; i++){
		this._child_combos[i] == _chcombo;
		this._child_combos.splice(i,1);
	}
	_chcombo.show(1);
}

dhtmlXCombo.prototype.showSubCombo = function(combo,state){
	if(combo._child_combos){
		for(var i = 0; i < combo._child_combos.length; i++){
			combo._child_combos[i].show(state);
			combo.showSubCombo(combo._child_combos[i],0);
		}
	}
}

dhtmlXCombo.prototype.deleteParentVariable = function(str){
	str = str.replace(/parent\=[^&]*/g,"").replace(/\?\&/,"?");
	return str;
}