function popup(url,width,height,left,top,target)
{
    if (!target)
        target = "_blank";

    if (!width)
        width = 300;
    if (!height)
        height = 300;

    if (!left)
        left = (screen.availWidth - width) / 2;
    if (!top)
        top = (screen.availHeight - height) / 2;

	var w = window.open(url,target,"left="+left+",top="+top+",height="+height+",width="+width+",toolbar=no,status=no,location=no,menubar=no,resizable=yes,scrollbars=yes");
    w.window.focus();
}

function popWin(url)
{
	var w = window.open(url,"4x4TrailInfo_popup","left=0,top=0,height=300,width=300,toolbar=no,status=no,location=no,menubar=no,resizable=yes,scrollbars=yes");
    w.window.focus();
}

function showGlossary(id)
{
	popWin("Glossary.php?term="+id);
}