/**
*     @desc: enables or disables options auto positioning
*     @param: flag - (boolean) true/false
*     @type: public
*/
dhtmlXCombo.prototype.enableOptionAutoPositioning = function(fl){
	if(!this.ListAutoPosit) this.ListAutoPosit = 1;
	this.attachEvent("onOpen",function(){this._setOptionAutoPositioning(fl);})
}

/**
*     @desc: set options auto positioning mode enables/disables
*     @param: flag - (boolean) true/false
*     @type: private
*/
dhtmlXCombo.prototype._setOptionAutoPositioning = function(fl){

	if((typeof(fl)!="undefined")&&(!convertStringToBoolean(fl))){
		this.ListPosition = "Bottom";
		this.ListAutoPosit = 0;
		return true
	}
	
	var pos = this.getPosition(this.DOMelem);
	var bottom = this._getClientHeight() - pos[1] - this.DOMelem.offsetHeight; 
	var height = (this.autoHeight)?(this.DOMlist.scrollHeight):parseInt(this.DOMlist.offsetHeight);
	
	if((bottom < height)&&(pos[1] > height)){
		this.ListPosition = "Top";
	}
	else this.ListPosition = "Bottom";
	this._positList();
}

/**
*     @desc: gets client height
*     @return: client height
*     @type: private
*/
dhtmlXCombo.prototype._getClientHeight = function(){
	return ((document.compatMode=='CSS1Compat') &&(!window.opera))?document.documentElement.clientHeight:document.body.clientHeight;
}

/**
*     @desc: set width of combo list
*     @param: width - (number) width
*     @type: public
*/

dhtmlXCombo.prototype.setOptionWidth = function(width){
	if(arguments.length > 0){
		this.DOMlist.style.width = width+"px";
     	if (this.DOMlistF) this.DOMlistF.style.width = width+"px";
	}
}

/**
*     @desc: set height of combo list
*     @param: height - (number) height
*     @type: public
*/

dhtmlXCombo.prototype.setOptionHeight = function(height){
	
	if(arguments.length>0){
		if(_isIE)
			this.DOMlist.style.height = this.DOMlistF.style.height =  height+"px";
		else
			this.DOMlist.style.height = height+"px"; 
		this._positList();
	}
	
}

/**
*     @desc: enables or disables options auto width 
*     @param: flag - (boolean) true/false
*     @type: public
*/
dhtmlXCombo.prototype.enableOptionAutoWidth = function(fl){
	if(!this._listWidthConf) this._listWidthConf = parseInt(this.DOMlist.style.width);
	if(arguments.length == 0){ var fl = 1; }
	if(convertStringToBoolean(fl)) {
		this.autoOptionWidth = 1;
		awOnOpen = z.attachEvent("onOpen",function(){this._setOptionAutoWidth()});
	}
	else {
		if(typeof(awOnOpen)!= "undefined"){
			this.autoOptionWidth = 0;	
			this.detachEvent(awOnOpen);
			this.setOptionWidth(this._listWidthConf);
		}
	}
} 

/**
*     @desc: set options auto width 
*     @param: flag - (boolean) true/false
*     @type: private
*/
dhtmlXCombo.prototype._setOptionAutoWidth = function(){
	this.setOptionWidth(1); 
    var x = this.DOMlist.offsetWidth;
    for ( var i=0; i<this.optionsArr.length; i++){
		var optWidth = (_isFF)?(this.DOMlist.childNodes[i].scrollWidth - 2):this.DOMlist.childNodes[i].scrollWidth;
       	if (optWidth > x){
       		x = this.DOMlist.childNodes[i].scrollWidth;
		}
	}
	this.setOptionWidth(x);
}

/**
*     @desc: enables or disables list auto height 
*     @param: flag - (boolean) true/false
*     @param: maxHeight - (int) height limitation (if a list height is bigger than maxHeight, a vertical scroll appears)
*     @type: public
*/
dhtmlXCombo.prototype.enableOptionAutoHeight = function(fl,maxHeight){
	if(!this._listHeightConf) this._listHeightConf = (this.DOMlist.style.height=="")?100:parseInt(this.DOMlist.style.height);
	if(arguments.length==0) var fl = 1; 
	this.autoHeight = convertStringToBoolean(fl);
	if(this.autoHeight){
		ahOnOpen = this.attachEvent("onOpen",function(){
			this._setOptionAutoHeight(fl,maxHeight);
			if(_isIE) this._setOptionAutoHeight(fl,maxHeight);
		})
	}
	else {
		if(typeof(ahOnOpen)!= "undefined"){
			this.detachEvent(ahOnOpen);
			this.setOptionHeight(this._listHeightConf);
		}
	}
	
}
 
/**
*     @desc: set auto height 
*     @param: flag - (boolean) true/false
*     @param: maxHeight - (int) height limitation (if a list height is bigger than maxHeight, a vertical scroll appears)
*     @type: private
*/
dhtmlXCombo.prototype._setOptionAutoHeight = function(fl,maxHeight){
	if(convertStringToBoolean(fl)){
		this.setOptionHeight(1); 
		var height = 0;
		if (this.optionsArr.length > 0){
			if(this.DOMlist.scrollHeight > this.DOMlist.offsetHeight){
  				height= this.DOMlist.scrollHeight + 2;
			}
			else height= this.DOMlist.offsetHeight;
			if((arguments.length > 1)&&(maxHeight)){
				var maxHeight = parseInt(maxHeight);
				height = (height>maxHeight)?maxHeight:height;
			}
			this.setOptionHeight(height)
		}
	}
}