window.onload = choosePic;

var myPix = new Array("../images/737uy_wide.jpg", "../images/8233y_low_wide.jpg", "../images/airport_home.jpg", "../images/image005.jpg", "../images/SR22_GTS_S0022-T_wide.jpg", "../images/SR22_GTS_S0356-T_wide.jpg", "../images/sunset_wide.jpg");

function choosePic(){
	randomNum = Math.floor((Math.random() * myPix.length));
	document.getElementById("mainpic").src = myPix[randomNum];
}