var NS6 = false;
var IE4 = (document.all)? true:false
var NS4 = (document.layers)? true:false
var NS6 = (document.getElementById)? true:false
var yesMac = false;
if (navigator.userAgent.indexOf("Mac")!=-1) yesMac = true;

function rollover(prefix,button,axtn){
    isrc = prefix + "-" + button + "-" + axtn
	if (document.images){document.images[button].src="graphics/"+isrc+".gif";	}
}

function rollover2(iname,isrc){
    if (document.images){document.images[iname].src=isrc;	}
}

function popup(newurl,winWidth,winHeight,tb){
	starttext = "toolbar=no,location=no,directories=no,status=no,scrollbars=yes,resizeable=no,";
	if(tb=="print") starttext = "toolbar=yes,location=no,directories=no,status=no,scrollbars=yes,resizeable=no,";
	if(tb=="art")  starttext = "toolbar=no,location=no,directories=no,status=no,scrollbars=no,resizeable=no,";
	featuretext = starttext + "width="+winWidth+",height="+winHeight+",left=5,top=5";
	mainView = window.open(newurl,'ImagePreview',featuretext);
	mainView.focus();
}

function xLink(whereto){
	newLoc = "xlink.asp?nL=" + whereto
	popup(newLoc,440,275)
}

function checkLink(linktxt){
	if (linktxt.indexOf('mfah.org')<0&&linktxt.indexOf('slideroom.com')<0) { xLink(linktxt);}
	else {window.open(linktxt);}
}