// store an interval in a variable
var pause1 = 4000;
var imgpath1 = "images/feature1/";

// create and initialize a counter                                    
var y1 = 0; 

// create an array of image file names                                         
var imgs1 = new Array ();
for(var n1=0; n1<(img_nums1); n1++){
	imgs1[n1] = "image"+n1+".jpg"
}

// preload all the images
var preload1 = new Array();                             

for( var x1 = 1; x1 < imgs1.length; x1++ )
{                                            
  preload1[x1] = new Image();           
  preload1[x1].src = imgs1[x1];                                     
}

// a function to display each image for the set interval
function rotatethis1()
{                      
  document.getElementById("photogallery").src = imgpath1 + imgs1[y1];                   
  ( y1 == (imgs1.length - 1 )) ? y1 = 0 : y1++;  
  window.setTimeout( "rotatethis1()", pause1 );                              
}