var newWin = null;

function popUp(strURL, strType, strHeight, strWidth, winName) {

	if (newWin != null && !newWin.closed)
//		newWin.close();
		var strOptions="";

	if (strType=="console")
		strOptions="scrollbars,resizable,height="+
		strHeight+",width="+strWidth;

	if (strType=="fixed")
		strOptions="status,height="+
		strHeight+",width="+strWidth;

	if (strType=="elastic")
		strOptions="toolbar,menubar,scrollbars,"+
		"resizable,location,height="+
		strHeight+",width="+strWidth;

	newWin = window.open(strURL, winName, strOptions);

	newWin.focus();
}

// <a href="my-pop-up-window.htm" onclick="popUp(this.href,'console',400,200);return false;" target="_blank">This is my link</a>

// http://www.sitepoint.com/article/perfect-pop-up