NN4 = (navigator.appVersion.charAt(0)>=4 && (navigator.appName).indexOf("Netscape") != -1);
IE4 = (navigator.appVersion.charAt(0)>=4 && (navigator.appVersion).indexOf("MSIE") != -1);

var onflag=1;


if ((NN4 == true) || (IE4 == true)){
	var onimg = new Array();
	var ofimg = new Array();
	var climg = new Array();
	msg = new Array();
	
	for(i=1;i<8;i++){
		onimg[i] = new Image();
		onimg[i].src = "image/menu" + i + "_on.gif";
	}
	for(i=1;i<8;i++){
		ofimg[i] = new Image();
		ofimg[i].src = "image/menu" + i + "_of.gif";
	}
	for(i=1;i<8;i++){
		climg[i] = new Image();
		climg[i].src = "image/menu" + i + "_cl.gif";
	}
}


function bt_on(nam1,num1,fr) {
	if(num1 != onflag){
		parent[fr].document.images[nam1].src = onimg[num1].src;
	}
}

function bt_off(nam1,num1,fr) {
	if(num1 != onflag){
		parent[fr].document.images[nam1].src = ofimg[num1].src;
	}
}

function bt_click(nam1,num1,fr) {
	onflag=num1;
	for(i=1;i<8;i++){
		menu = "menu" + i;
		parent[fr].document.images[menu].src = ofimg[i].src;
	}
	parent[fr].document.images[nam1].src = climg[num1].src;

}


function bt_click_main(nam1,num1,fr) {
	loc = "top" + num1 + ".html";
		parent[fr].location.href = loc;
}