var period;
function changeImage(im) {
	switch(im) {
		case 'temp1':
			document.images["graphs"].src = 'create_temp_graph1.php';
			break;
		case 'press1':
			document.images["graphs"].src = 'create_press_graph1.php';
			break;
		case 'wind1':
			document.images["graphs"].src = 'create_wind_graph1.php';
			break;
		case 'rain1':
			document.images["graphs"].src = 'create_rain_graph1.php';
			break;
		case 'temp3':
			document.images["graphs"].src = 'create_temp_graph3.php';
			break;
		case 'press3':
			document.images["graphs"].src = 'create_press_graph3.php';
			break;
		case 'wind3':
			document.images["graphs"].src = 'create_wind_graph3.php';
			break;
		case 'rain3':
			document.images["graphs"].src = 'create_rain_graph3.php';
			break;
		case 'temp6':
			document.images["graphs"].src = 'create_temp_graph6.php';
			break;
		case 'press6':
			document.images["graphs"].src = 'create_press_graph6.php';
			break;
		case 'wind6':
			document.images["graphs"].src = 'create_wind_graph6.php';
			break;
		case 'rain6':
			document.images["graphs"].src = 'create_rain_graph6.php';
			break;
		case 'temp12':
			document.images["graphs"].src = 'create_temp_graph12.php';
			break;
		case 'press12':
			document.images["graphs"].src = 'create_press_graph12.php';
			break;
		case 'wind12':
			document.images["graphs"].src = 'create_wind_graph12.php';
			break;
		case 'rain12':
			document.images["graphs"].src = 'create_rain_graph12.php';
			break;	
			case 'temp24':
			document.images["graphs"].src = 'create_temp_graph24.php';
			break;
		case 'press24':
			document.images["graphs"].src = 'create_press_graph24.php';
			break;
		case 'wind24':
			document.images["graphs"].src = 'create_wind_graph24.php';
			break;
		case 'rain24':
			document.images["graphs"].src = 'create_rain_graph24.php';
			break;	
	}	
}