function set_btn(aButtonName,mode) 
{ 
	if (document.getElementById)
	{
		obj1 = document.getElementById(aButtonName+ '_b1');
	    obj2 = document.getElementById(aButtonName+ '_b2');
		obj3 = document.getElementById(aButtonName+ '_b3');
	}
    switch (mode)
    {
		case '':
    		obj1.src = 'images/b1.gif';
			obj3.src = 'images/b3.gif';
			obj2.className='ButtonText';
			break;
		case 'o':
    		obj1.src = d.img_po[0].src;
			obj3.src =  d.img_po[2].src;
			obj2.className='ButtonOverText';
			break;
		case 'd':
    		obj1.src =  d.img_pd[0].src;
			obj3.src =   d.img_pd[2].src;
			obj2.className='ButtonDownText';
			break;
	}
}

/* Functions that handle preload. */
	var d=document; 
	if(d.images)
		{ 
		if(!d.img_pd) 
			d.img_pd=new Array();
		if(!d.img_po)
			d.img_po=new Array();
		
		d.img_pd[0]=new Image;
		d.img_pd[0].src = 'images/bd1.gif';
		d.img_pd[1]=new Image;
		d.img_pd[1].src = 'images/bd2.gif';
		d.img_pd[2]=new Image;
		d.img_pd[2].src = 'images/bd3.gif';
		d.img_po[0]=new Image;
		d.img_po[0].src = 'images/bo1.gif';
		d.img_po[1]=new Image;
		d.img_po[1].src = 'images/bo2.gif';
		d.img_po[2]=new Image;
		d.img_po[2].src = 'images/bo3.gif';
		}