function allHidden () 
	{
		if (is.ie) 
		{
				this.document.all.zoomZeroDiv.style.visibility="hidden";
				this.document.all.zoomOneDiv.style.visibility="hidden";
				this.document.all.zoomTwoDiv.style.visibility="hidden";
				this.document.all.zoomThreeDiv.style.visibility="hidden";
				this.document.all.zoomFourDiv.style.visibility="hidden";
				
		} 
		else 
		{
				this.document.all.zoomZeroDiv.style.visibility="hide";
				this.document.all.zoomOneDiv.style.visibility="hide";
				this.document.all.zoomTwoDiv.style.visibility="hide";
				this.document.all.zoomThreeDiv.style.visibility="hide";
				this.document.all.zoomFourDiv.style.visibility="hide";
				
		}
	}
	// view current zoom level
	function viewCurrLevel( level ) 
	{
			
		if (is.ie) 
		{
			if ( level==0 )
			{
				this.document.all.zoomZeroDiv.style.visibility="visible";
				//radioValue();
			}
			if ( level==1 )
			{
				this.document.all.zoomOneDiv.style.visibility="visible";
				//radioValue();
			}
			if ( level==2 )
			{
				this.document.all.zoomTwoDiv.style.visibility="visible";
				isIllust = this.document.Nextmap.getIsIllust();
				if( isIllust == false )
				{
				   // radioValue();
				}
				
			}
			if ( level==3 )
			{
				this.document.all.zoomThreeDiv.style.visibility="visible";
				
				
			}
			if ( level==4 )
			{
				this.document.all.zoomFourDiv.style.visibility="visible";
				
			}
			
		} 
		else 
		{
		
			if ( level==0 )
			{
				this.document.all.zoomZeroDiv.style.visibility="show";
			}
			if ( level==1 )
			{
				this.document.all.zoomOneDiv.style.visibility="show";
			}
			if ( level==2 )
			{
				this.document.all.zoomTwoDiv.style.visibility="show";
			}
			if ( level==3 )
			{
				this.document.all.zoomThreeDiv.style.visibility="show";
			}
			if ( level==4 )
			{
				this.document.all.zoomFourDiv.style.visibility="show";
			}
			
		}
		

	}
    	
	function zoom(zn) 
	{
	    
		if (zn < 0) zn = 0;
		if (zn > 4) zn = 4;
        isIllust = this.document.Nextmap.getIsIllust();
        if( isIllust == true && zn == 0 )
        {
            //alert( "ÀÏ·¯½ºÆ®¸ÊÀÇ ÃÖ¼Ò·¹º§Àº 1·¹º§ÀÔ´Ï´Ù. \n ·¹º§1·Î ÀüȯÇÕ´Ï´Ù." );
            zn = 1;
        }
        
		//viewCurrLevel(zn);
        this.document.Nextmap.goLevel(zn);
        //this.document.frmDisplay.display.value = " ¿øÇϽô ·¹º§ÀÇ ¹öÆ°À» ´­·¯ÁÖ¼¼¿ä ÀÔ´Ï´Ù.  ÇöÀç Áöµµ´Â" +zn+" ·¹º§ÀÔ´Ï´Ù.      ";
	    
	} 

	function zoomIn()
	{
		this.document.Nextmap.setCanvasMode( 1 );
    }

	function zoomOut()
	{
		this.document.Nextmap.setCanvasMode( 2 );
    }
   
   function zoomBarIn()
   {
   	
   	    l = this.document.Nextmap.getUserZoomLevel();
		zn = l + 1;
		if( zn > 4 ) zn = 4;
		
		zoom(zn);
   }	
   
   function zoomBarOut()
   {
   	
   	    l = this.document.Nextmap.getUserZoomLevel();
        isIllust = this.document.Nextmap.getIsIllust();
		
		zn = l - 1;
		
		if( zn < 0 ) zn = 0;
		
		if( isIllust == true && zn <= 0 )
		{
		    alert( "The Minimum level of this Illustrated map is 1 level.\nPlease zoom in" );
		    zn = 1;
		}
   	    
   	    zoom(zn);
   	
   }