function popup(url,name,width,height) {
	var features = [
		['toolbar',		0],
		['directories',	0],
		['menubar',		0],
		['status',		0],
		['resizable',	1],
		['location',	0],
		['scrollbars',	0],
		['copyhistory',	0]
		];
	for (var nr = 4; nr < popup.arguments.length; nr++) {
		var param = popup.arguments[nr].split('=');
		for (var i = 0; i < features.length; i++)
			if (features[i][0] == param[0]) {
				features[i][1] = param[1];
				break;
				}
		if (i == features.length)
			features[i] = param;
		}
	var feature_string = 'width=' + width + ',height=' + height;
	for (var i = 0; i < features.length; i++)
		feature_string += ',' + features[i][0] + '=' + features[i][1];
	window.open(url,name,feature_string);
	}