I keep getting this error when I use my popImage() call:
Error: missing ) after argument list
Source File: javascript:popImage(photo_album/3.jpg,optional title);
Line: 1, Column: 23
Source Code:
popImage(photo_album/3.jpg,optional title);

I've tried everything I can think of as to why it keeps craping out on me. Here is my code, can anyone out there help me?

Code:
PositionX = 100;
PositionY = 100;
defaultWidth  = 500;
defaultHeight = 500;
var AutoClose = true;
// Do not edit below this line...
// ================================
if(parseInt(navigator.appVersion.charAt(0))>=4)
{
	var isNN=(navigator.appName=="Netscape")?1:0;
	var isIE=(navigator.appName.indexOf("Microsoft")!=-1)?1:0;}
	var optNN='scrollbars=no,width='+defaultWidth+',height='+defaultHeight+',left='+PositionX+',top='+PositionY;
	var optIE='scrollbars=no,width=150,height=100,left='+PositionX+',top='+PositionY;
	function popImage(imageURL,imageTitle)
	{
		if (isNN)
		{
			imgWin=window.open('about:blank','',optNN);
		}
		if (isIE)
		{
			imgWin=window.open('about:blank','',optIE);
		}
		with (imgWin.document)
		{
			writeln('<html><head><title>Loading...</title><style>body{margin:5px;}</style></head>');
			writeln('<sc'+'ript>');
			writeln('var isNN,isIE;');
			writeln('if (parseInt(navigator.appVersion.charAt(0))>=4){');
			writeln('isNN=(navigator.appName=="Netscape")?1:0;');
			writeln('isIE=(navigator.appName.indexOf("Microsoft")!=-1)?1:0;}');
			writeln('function reSizeToImage(){');
			writeln('if (isIE){');
			writeln('window.resizeTo(100,100);');
			writeln('width=100-(document.body.clientWidth-(document.images[0].width + 15));');
			writeln('height=100-(document.body.clientHeight-(document.images[0].height + 20));');
			writeln('window.resizeTo(width,height);}');
			writeln('if (isNN){');
			writeln('window.innerWidth=document.images["George"].width;');
			writeln('window.innerHeight=document.images["George"].height;}}');
			writeln('function doTitle(){document.title="'+imageTitle+'";}');
			writeln('</sc'+'ript>');
			if (!AutoClose) 
				writeln('</head><body bgcolor=000000 scroll="no" onload="reSizeToImage();doTitle();self.focus()">')
			else 
				writeln('</head><body bgcolor=FFFFFF scroll="no" onload="reSizeToImage();doTitle();self.focus()" onblur="self.close()">');
			writeln('<div align="center"><img name="George" src='+imageURL+' border=0></div><div align="right"><a href="javascript: window.close(); style="STYLE="font-size:10; color:#575757; font-family: Verdana; text-decoration: underline;">close window</a></div></body></html>');
		close();
	}
}

var dimension="3x5" //Specify dimension of gallery (number of images shown), such as 4x2, 3x1 etc

//Specify images:
//galleryarray[x]=["path_to_image", "optional_title_attribute", "optional_text_description", "optional_link"]
var galleryarray=new Array()
galleryarray[0]=["photo_album/1.jpg", "optional title", "optional description", "photo_album/1.jpg"]
galleryarray[1]=["photo_album/2.jpg", "optional title", "optional description", "photo_album/2.jpg"]	
galleryarray[2]=["photo_album/3.jpg", "optional title", "optional description", "photo_album/3.jpg"]
galleryarray[3]=["photo_album/4.jpg", "optional title", "optional description", "photo_album/4.jpg"]
galleryarray[4]=["photo_album/5.jpg", "optional title", "optional description", "photo_album/5.jpg"]
galleryarray[5]=["photo_album/6.jpg", "optional title", "optional description", "photo_album/6.jpg"]
galleryarray[6]=["photo_album/7.jpg", "optional title", "optional description", "photo_album/7.jpg"]
galleryarray[4]=["photo_album/8.jpg", "optional title", "optional description", "photo_album/8.jpg"]
galleryarray[5]=["photo_album/9.jpg", "optional title", "optional description", "photo_album/9.jpg"]
galleryarray[6]=["photo_album/10.jpg", "optional title", "optional description", "photo_album/10.jpg"]

var href_target="_new" //Enter target attribute of links, if applicable

var totalslots=dimension.split("x")[0]*dimension.split("x")[1]

function buildimage(i)
{
	var tempcontainer=galleryarray[i][3]!=""? '<a href="javascript:popImage('+galleryarray[i][3]+','+galleryarray[i][1]+');">' : ""
	tempcontainer+='<img src="'+galleryarray[i][0]+'" border="1" title="'+galleryarray[i][1]+'">'
	tempcontainer=galleryarray[i][3]!=""? tempcontainer+'</a>' : tempcontainer
	tempcontainer=galleryarray[i][2]!=""? tempcontainer+'<br \/>'+galleryarray[i][2] : tempcontainer
	return tempcontainer
}

function jumptopage(p)
{
	var startpoint=(p-1)*totalslots
	var y=1;
	for (i=0; i<totalslots; i++)
	{
		document.getElementById("slide"+i).innerHTML=(typeof galleryarray[startpoint+i]!="undefined")? buildimage(startpoint+i) : ""
	}
	while(document.getElementById("navlink"+y)!=null)
	{
		document.getElementById("navlink"+y).className=""
		y++
	}
	document.getElementById("navlink"+p).className="current"
}

var curimage=0
for (y=0; y<dimension.split("x")[1]; y++)
{
	for (x=0; x<dimension.split("x")[0]; x++)
	{
		if (curimage<galleryarray.length)
			document.write('<div id="slide'+curimage+'" class="slideshow">'+buildimage(curimage)+'</div>')
			curimage++
	}
	document.write('<br style="clear: left" />')
}

for (i=1; i<Math.ceil(galleryarray.length/totalslots)+1; i++)
	document.write('<a id="navlink'+i+'" href="javascript:jumptopage('+i+')\">Page '+i+'</a> ')
document.getElementById("navlink1").className="current"
Thanks!