var isIE = 0;		// Are we running under Internet Explorer?
    var isNav = 0;		// Are we running under Netscape Navigator?
    var Vnum = 0;				// Browser version number
    var layerRef="", styleSwitch="";		// DOM references

    //  Determine our browser
    if (navigator.appName == 'Netscape'){
	if (document.layers) {
            layerRef = 'document.layers';
            styleSwitch = '';
	}
	isNav = 1;
	Vnum = navigator.appVersion.substring(0, 1);
    }
    else if (navigator.appName == 'Microsoft Internet Explorer'){
        if( document.all) {
	    layerRef = 'document.all';
            styleSwitch = '.style';
	}
	isIE = 1;
	Vnum = navigator.userAgent.substring(30, 31);
    }

    // if we have an older version of NAV, open browser window;
    // Nav 3.x will let us do this, but it must be done in the HEAD section.
    if (Vnum < 4 && isNav) {
	window.open("browser.htm","wname","width=580,height=350,toolbar=0,location=0,directories=0,menubar=0,scrollbars=0,resizeable=0");
    }

    //  Rollover code to display div/layer
    function flash(layerID, value){
	if(Vnum >= 4){
	  if (value == 0)
 	    eval(layerRef + '["' + layerID + '"]' + styleSwitch + '.visibility="hidden"');
	  else
	    eval(layerRef + '["' + layerID + '"]' + styleSwitch + '.visibility="visible"');
        }
    }