// JavaScript Document
function show(element_id, display_type) {
	document.getElementById(element_id).style.display = display_type;
}

function hide(element_id) {
	document.getElementById(element_id).style.display = "none";

}

function popup(filename, width, height) {
	var center_left = (screen.width/2) - width/2;
	var center_top = (screen.height/2) - height/2;
	var filename_array = filename.split(".");
	z = window.open(filename, filename_array[0], 'width=' + width + ',height=' + height + ',left=' + center_left + ',top=' + center_top + ',scrollbars=yes,resizable=yes');
	z.focus();
}