var agent="unknown";
if (navigator.appName.indexOf('Netscape')!=-1)
	if (document.layers) agent="NS";
	else agent="MZ";
if (document.all) agent="IE";
if (navigator.appName.indexOf('Opera')!=-1) agent="MZ";

//**********************************************************

var layerDef="";
var layerOpt="";

switch (agent) {
	case "IE":
		layerDef="document.all['";
		layerOpt="'].style";
		break;

	case "NS":
		layerDef="document.layers['";
		layerOpt="']";
		break;

	case "MZ":
		layerDef="document.getElementById('";
		layerOpt="').style";
		break;		
	}

//**********************************************************

/*
if (agent!="unknow") {

	switch (agent) {
	case "NS":
		a=parseInt((window.innerWidth-16)/2);
		break;

	case "IE":
		if (window.innerWidth) 
			a=parseInt(window.innerWidth/2);
		else
			a=parseInt(document.body.clientWidth/2);			
		break;

	case "MZ":
		if (document.width)
			a=parseInt((document.width)/2);
		else
			a=parseInt((window.innerWidth)/2);
		break;
	}
}
*/
var layerDef="";
var layerOpt="";

switch (agent) {
	case "IE":
		layerDef="document.all['";
		layerOpt="'].style";
		break;

	case "NS":
		layerDef="document.layers['";
		layerOpt="']";
		break;

	case "MZ":
		layerDef="document.getElementById('";
		layerOpt="').style";
		break;		
	}

//**********************************************************