function show_btn() {
	if (window.print) {
		btn = document.getElementById('print_btn') ;
		btn.style.display = 'block' ;
	}
}
function print_pop(href) {
	window.open(href, 'printWin', 'width=600, height=500, top=100, left=100, scrollbars=yes') ;
}
function map_pop(url) {
	window.open(url, 'printWin', 'width=570, height=410, top=200, left=200, scrollbars=no') ;
}