function winOpen(winUrl, winName, winParameters) {
	winUrl = (winUrl)?winUrl:'about:blank';
	winName = (winName)?winName:'popupwin'+Math.random();
	winParameters = (winParameters)?winParameters:'width=700, height=510';
	try {
		newin = window.open(winUrl, winName, winParameters+', scrollbars=yes, resizable=yes');
		newin.focus();
		return newin;
	} catch(e){
		alert("error: "+e);
		return false;
	}
}