// show hide layer
function shwlay(laynam) {
	if(document.layers){document.layers[laynam].visibility = "show";}
	else if(document.all){document.all[laynam].style.visibility = "visible";}
}

function hidlay(laynam) {
	if(document.layers){document.layers[laynam].visibility = "hide";}
	else if(document.all){document.all[laynam].style.visibility = "hidden";}
}

function wopen(h,v,which_html, win_name,toolb,loc,dir,statu,menub,scrollb,resiz,copyhist){
	var opwin;
	opwin = window.open(which_html, win_name, 'toolbar='+toolb+',location='+loc+',directories='+dir+',status='+statu+',menubar='+menub+',scrollbars='+scrollb+',resizable='+resiz+',copyhistory='+copyhist+',width='+h+',height='+v);
   opwin.focus();
}

// move layer
function mvbylayer(layernam, vh, vv){ // relative
	if(document.all){
		var lyleft= document.all[layernam].style.pixelLeft;
		var lytop = document.all[layernam].style.pixelTop;
		document.all[layernam].style.left = (vh + lyleft);
		document.all[layernam].style.top = (vv + lytop);
	}else if(document.layers){
		document.layers[layernam].moveBy(vh,vv);
	}
}

function mvtolayer(layernam, vh, vv){ // absolute
	if(document.all ){
		document.all[layernam].style.pixelLeft = vh;
		document.all[layernam].style.pixelTop = vv;
	}else if(document.layers){
		document.layers[layernam].moveTo(vh,vv);
	}
}

// clip layer
function cliply(laynam,ct,cb,cl,cr){
 	 if(document.layers){
		with(document.layers[laynam].clip){ top=ct; right=cr; bottom=cb; left=cl;}
	}else if(document.all){
		document.all(laynam).style.clip='rect('+ct+','+cr+','+cb+','+cl+')';
	}
}

// preload images
function btload(nam,isrc){
	var b; var bisrc;
	eval(nam +' = new Image()')
	eval(nam +'.src = "' + isrc +'"')
	if (isrc.match(/.gif/i) != null){bisrc = isrc.replace(/.gif/i,"on.gif");}
	else if (isrc.match(/.jpg/i) != null){bisrc = isrc.replace(/.jpg/i,"on.jpg");}
	b = nam + 'on';
	eval(b +' = new Image()')
	eval(b +'.src = "' + bisrc +'"')
}

function imgload(na,isr){
	eval(na +' = new Image()')
	eval(na +'.src = "' + isr +'"')
}

function btlistload(imglist){
	var flg = 0; var imgnam; var imgsrc;
	for(i = 0 ; i < imglist.length ; i++) {
		if (flg == 0){imgnam = imglist[i]; flg = 1;}
		else {imgsrc = imglist[i]; btload(imgnam,imgsrc); flg = 0;}
	}
}

// swap image
function btly(lyname,btName,imgName){
	if(document.all){document[btName].src = eval(imgName + ".src")}
	else if(document.layers){document.layers[lyname].document[btName].src = eval(imgName + ".src")}
}

function bt(btName,imgName){document[btName].src = eval(imgName + ".src");}