function changeBullet(strImagePlus, strImageMinus, strObject){
	var dv = document.getElementById(strObject);
	var pi =  document.getElementById(strImagePlus);
	var mi =  document.getElementById(strImageMinus);
	if( dv.style.display == "inline"){
		pi.scr='/qmimages/symbol_1.gif';
		dv.style.display = 'none';	
		pi.style.display = 'inline';
		mi.style.display = 'none';
	}else{
		pi.scr='/qmimages/symbol_2.gif';
		dv.style.display = 'inline';
		pi.style.display = 'none';
		mi.style.display = 'inline';
	}
}