[KidsKilla]

function openWin(src, w, h, name, prop, txt){
	var o2s = function(o){
		var str = "";
		for(var i in o) str+=(i+"="+o[i]+",");
			str= str.substr(0,(str.length-1));
		return str;
	};
	if (self.screen) {
		sw=screen.width
		sh=screen.height;
	} else if (self.java) {
		var j=java.awt.Toolkit.getDefaultToolkit();
		var s=j.getScreenSize();
		sw=s.width
		sh=s.height;
	}
	sw = sw||1024;
	sh = sh||768;
	w = w||sw/2;
	h = h||sh/2;
	var o = {
		resizable:'yes',
		menubar:'no',
		status:'yes',
		scrollbars:'yes',
		address:'no',
		width:w,
		height:h,
		left:((sw-w)/2),
		top:((sh-h)/2)
		};
	if(typeof prop == "object"){
		for(var i in prop) 
			o[i] = prop[i].toString();
		prop = "";
		prop = o2s(o);
	} else {
		prop = prop||o2s(o);
	}
	src = src||"about:blank";
	name = name ||"_blank";
	win = window.open(src, name, prop);
	if(txt)
		win.document.write(txt);
	return win;
}

использовать:
<a href="http://mysite.ru/" onclick="openWin(this.href, 200, 200, null, {resizable:'no'}).focus();return false;">ссылка</a>