function is_sWin() {
		var ua = navigator.userAgent;
		if (!!window.subWin) {
			if ( ua.indexOf('MSIE 4') != -1 && ua.indexOf('Win') != -1) {
				return !subWin.closed;
			} else { 
				return typeof subWin.document  == 'object';
			}
		} else { 
			return false;
		}
	}

	function call(f){
		if ( is_sWin()){
			subWin.location.href = f;
		} else {
			subWin = window.open(f,"sub","width=640,height=400,resizable=yes,scrollbars=yes");
		}
		subWin.focus();
	}