var windowNumber = 0;
var windowFrame = {width:0,height:0};
var sizeMainWindow = {width:0,height:0};
var mediaWindow = {top:0,left:0};
var currentParams = {};

function WindowOpenNewwin( url, width, height, windowName, param ) {
	
	sizeMainWindow.width = width;
	sizeMainWindow.height = height;
	
	if (windowNumber == 0) {
		var left = (screen.width - width) / 2;
		var top = (screen.height - height) / 2;
	}
	else {
		var tmp_left = (screen.width - width) / 2 + windowNumber * 20;
		var tmp_top = (screen.height - height) / 2 + windowNumber * 20;
		var left = Math.max(0, Math.min(tmp_left, screen.width - width));
		var top = Math.max(0, Math.min(tmp_top, screen.height - height));
	}
	var hwnd = window.open( url, windowName, "width=" + width + ",height=" + height + ","
		+ "resizable=" + ((param.resizable)?param.resizable:'yes') + ","
		+ "scrollbars=" + ((param.scrollbars)?param.scrollbars:'yes') + ","
		+ "screenX=" + left + ","
		+ "screenY=" + top + ","
		+ "left=" + left + ","
		+ "top=" + top + ""
	);
	windowNumber++;
}