// create a new array and assign images to 31 elements

var pix = new Array;
pix[1] = "http://www.mjohnsonfamily.com/Fishing/Pictures/Intro/intro1.jpg";
pix[2] = "http://www.mjohnsonfamily.com/Fishing/Pictures/Intro/intro2.jpg";
pix[3] = "http://www.mjohnsonfamily.com/Fishing/Pictures/Intro/intro3.jpg";
pix[4] = "http://www.mjohnsonfamily.com/Fishing/Pictures/Intro/intro4.jpg";
pix[5] = "http://www.mjohnsonfamily.com/Fishing/Pictures/Intro/intro5.jpg";  
pix[6] = "http://www.mjohnsonfamily.com/Fishing/Pictures/Intro/intro6.jpg";
pix[7] = "http://www.mjohnsonfamily.com/Fishing/Pictures/Intro/intro7.jpg";
pix[8] = "http://www.mjohnsonfamily.com/Fishing/Pictures/Intro/intro8.jpg";
pix[9] = "http://www.mjohnsonfamily.com/Fishing/Pictures/Intro/intro9.jpg";
pix[10] = "http://www.mjohnsonfamily.com/Fishing/Pictures/Intro/intro10.jpg";
pix[11] = "http://www.mjohnsonfamily.com/Fishing/Pictures/Intro/intro11.jpg"; 
pix[12] = "http://www.mjohnsonfamily.com/Fishing/Pictures/Intro/intro12.jpg";
pix[13] = "http://www.mjohnsonfamily.com/Fishing/Pictures/Intro/intro13.jpg";
pix[14] = "http://www.mjohnsonfamily.com/Fishing/Pictures/Intro/intro14.jpg";
pix[15] = "http://www.mjohnsonfamily.com/Fishing/Pictures/Intro/intro15.jpg";  
pix[16] = "http://www.mjohnsonfamily.com/Fishing/Pictures/Intro/intro16.jpg";
pix[17] = "http://www.mjohnsonfamily.com/Fishing/Pictures/Intro/intro17.jpg";
pix[18] = "http://www.mjohnsonfamily.com/Fishing/Pictures/Intro/intro18.jpg";
pix[19] = "http://www.mjohnsonfamily.com/Fishing/Pictures/Intro/intro19.jpg";
pix[20] = "http://www.mjohnsonfamily.com/Fishing/Pictures/Intro/intro20.jpg";
pix[21] = "http://www.mjohnsonfamily.com/Fishing/Pictures/Intro/intro21.jpg";
pix[22] = "http://www.mjohnsonfamily.com/Fishing/Pictures/Intro/intro22.jpg";
pix[23] = "http://www.mjohnsonfamily.com/Fishing/Pictures/Intro/intro23.jpg";
pix[24] = "http://www.mjohnsonfamily.com/Fishing/Pictures/Intro/intro24.jpg";
pix[25] = "http://www.mjohnsonfamily.com/Fishing/Pictures/Intro/intro25.jpg";  
pix[26] = "http://www.mjohnsonfamily.com/Fishing/Pictures/Intro/intro26.jpg";
pix[27] = "http://www.mjohnsonfamily.com/Fishing/Pictures/Intro/intro27.jpg";
pix[28] = "http://www.mjohnsonfamily.com/Fishing/Pictures/Intro/intro28.jpg";
pix[29] = "http://www.mjohnsonfamily.com/Fishing/Pictures/Intro/intro29.jpg";
pix[30] = "http://www.mjohnsonfamily.com/Fishing/Pictures/Intro/intro30.jpg";

// get a random integer between 0 and 20

var rand = Math.floor(Math.random() * 30);

// assign random image to the HTML <img> tag of pic id 
document.getElementById("pic").src = pix[ rand ];