var new_page;

function openpage(source) {
	closepage();
	new_page=window.open(source, "cswindow", "height=454,width=397,toolbar=no,status=no,menubar=no,scrollbars=no,top=90,left=20");
}

function closepage() {

	if(navigator.appVersion.indexOf("MSIE")!=-1)	{
		try {
			new_page.close();
		}
		catch (e) {}
	}

}

window.onunload=closepage;