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", "images/topview_cockpit_wide.jpg", "images/wt vort 757.jpg", "images/wide_j0399320.jpg", "images/kingair_wide.jpg", "images/GTS_sterling9_wide.jpg", "images/falcon_night.jpg", "images/73_fltdesk_dark.jpg");

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