var vertical_center = (screen.height / 2);
var horizontal_center = (screen.width / 2);

function openLink (width,height,page) {
	infowindow = window.open
	    (page,"child","resizable=1,status=yes,toolbar=no,scrollbars=yes,width="+width+",height="+height+",top="+(vertical_center-height/2-30)+",left="+(horizontal_center-width/2));
}

function openELink (width,height,page) {
	editorwindow = window.open
	    (page,"echild","resizable=1,status=yes,toolbar=no,scrollbars=yes,width="+width+",height="+height+",top="+(vertical_center-height/2-30)+",left="+(horizontal_center-width/2));
}

function opensubLink (width,height,page) {
	subinfowindow = window.open
	    (page,"xchild","resizable=1,status=yes,toolbar=no,scrollbars=yes,width="+width+",height="+height+",top="+(vertical_center-height/2-30)+",left="+(horizontal_center-width/2));
}

function openHelp (subject) {
	helpwindow = window.open
	    ("/sys4_siteserver/system/help.php4?subject="+subject,"helpvindue","resizable=1,status=yes,toolbar=no,scrollbars=yes,width=600,height=400,top="+(vertical_center-400/2-30)+",left="+(horizontal_center-600/2));
}

function isInt(xvalue) {
	return !isNaN(xvalue) && (xvalue.indexOf(".") == -1);
}

function strmatch(regex,streng) {
	return regex.test(streng);
}