var images = new Array();

images[0] = "images/tech_equip.jpg";  
images[1] = "images/tech_equip2.jpg";
images[2] = "images/tech_equip3.jpg";
images[3] = "images/tech_equip4.jpg";
images[4] = "images/tech_equip5.jpg";
images[5] = "images/tech_equip6.jpg";

/*
images[6] = "";
images[7] = "";
images[8] = "";
images[9] = "";
images[10] = "";
*/

function ShowImg() {
var number = images.length;
var increment = Math.floor(Math.random() * number);
var strTemp ='<img src='+images[increment]+'>';
document.write(strTemp);
}

var rotate = 5000; 
var count = 0;

function RotateImg(introImage){
 introImage.src=images[count];
 count++;
 if(count==images.length){count = 0;}
 setTimeout("RotateImg(introImage)",rotate);
}