function OpenWindow(ShowFile,WindowWidth,WindowHeight,WindowName) {	
	WindowPosX = (screen.width-WindowWidth) /2;
	WindowPosY = (screen.height-WindowHeight) /2;
	WParam = 'menubar=no,resizable=no,scrollbars=no,status=no,toolbar=no';
	WindowParam = 'width='+WindowWidth+',height='+WindowHeight+',top='+WindowPosY+',left='+WindowPosX+WParam;
	if(document.layers) {
		WindowParam +=	',resizable=yes';
	}
	var CenterWindow = window.open(ShowFile,WindowName,WindowParam);
	CenterWindow.focus();
}