var image1 = new Image(); 
image1.src = "files/1.jpg"; 
var image2 = new Image(); 
image2.src = "files/2.jpg"; 
var image3 = new Image(); 
image3.src = "files/3.jpg"; 
var image4 = new Image(); 
image4.src = "files/4.jpg"; 
var image5 = new Image(); 
image5.src = "files/5.jpg"; 
var image6 = new Image(); 
image6.src = "files/6.jpg"; 
var image7 = new Image(); 
image7.src = "files/7.jpg"; 
var image8 = new Image(); 
image8.src = "files/8.jpg"; 
var image9 = new Image(); 
image9.src = "files/9.jpg"; 
var image10 = new Image(); 
image10.src = "files/10.jpg"; 
var image11 = new Image(); 
image11.src = "files/11.jpg"; 
var image12 = new Image(); 
image12.src = "files/12.jpg";

function change_image(val) { 

switch (val){
	case 1:
		document["view"].src = image1.src; 
		break;
	case 2:
		document["view"].src = image2.src; 
		break;
	case 3:
		document["view"].src = image3.src; 
		break;
      case 4:
		document["view"].src = image4.src; 
		break;
	case 5:
		document["view"].src = image5.src; 
		break;
	case 6:
		document["view"].src = image6.src; 
		break;
      case 7:
		document["view"].src = image7.src; 
		break;
	case 8:
		document["view"].src = image8.src; 
		break;
	case 9:
		document["view"].src = image9.src; 
		break;
      case 10:
		document["view"].src = image10.src; 
		break;
	case 11:
		document["view"].src = image11.src; 
		break;
	case 12:
		document["view"].src = image12.src; 
		break;

	}
}