var NN = (navigator.appName == "Netscape")

if  (document.images) 
{  
img001 = new Image ;
img002 = new Image;  
img001.src = "/i/ico/005.gif";
img002.src = "/i/ico/005.gif"; 
}


function expbl(bl) {
	
var opnbl = 'seto' + bl
var imopn = 'img'+ bl

var opnblch = document.getElementById(opnbl).style.display

if (opnblch == 'block') {
	document.getElementById(opnbl).style.display = "none"
	imgscr1 = '/i/ico/005.gif'
	if (NN) {
		document.getElementById("mainhull").style.display = "none"
		document.getElementById("mainhull").style.display = "block"
		
	}
} else {
	document.getElementById(opnbl).style.display = "block"
	imgscr1 = '/i/ico/006.gif'
}
document.getElementById(imopn).src = imgscr1

}