function popup( a, w, h, x, y ){
	var where = a.href;
		
	if( w == "fullscreen" ){
		x = 0;
		y = 0;
		w = (screen.availWidth-10);
		h = (screen.availHeight-50);
	}
	else{
		if( ! x ) x = 100;
		if( ! y ) y = 100;
	}
	
	var chrome='left=' + x + ',top=' + y + ',width=' + w + ',height=' + h + ',scrollbars=no,resizable=yes';
	
	window.newWin = window.open( where, "newWin", chrome );
	if( newWin ){
		newWin.focus();
		return false;
	}
	else{
		return true;
	}
}