function popup(url){
	newWindow=window.open(url, '_blank', 'width=600,height=200,toolbars=no,scrollbars=yes');
}
function popup_big(url){
	newWindow=window.open(url, '_blank', 'width=1220,height=900,toolbars=no,scrollbars=yes');
}
function confirm_delete(url_1, url_2){
	a=confirm('Do you really want to delete?');
	b=(a==true)?url_1:url_2;
	document.location.href=b;
}