// Javascript image functions

        function MM_preloadImages() { //v3.0
          var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
            var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
            if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
        }

        function MM_swapImgRestore() { //v3.0
          var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
        }

        function MM_findObj(n, d) { //v4.01
          var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
            d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
          if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
          for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
          if(!x && d.getElementById) x=d.getElementById(n); return x;
        }

        function MM_swapImage() { //v3.0
          var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
           if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
        }

        var delay = 5000;
        var counter = 0;
        
        imgs = new Array('img_aviation.jpg','img_energy.jpg','img_marine.jpg','img_nonmarine.jpg');

        function preloadImgs(){
            x=MM_findObj('mainImage');
	        aPath = x.src.split('/');
	        aPath.splice(aPath.length - 1,1);
            for(var i=0;i<imgs.length;i++){
                MM_preloadImages(aPath.join('/') + '/' + imgs[i]);
            }
           
        }

        function randomImages(){
            if(counter == (imgs.length)){
                counter = 0;
            }
            MM_swapImage('mainImage', '', aPath.join('/') + '/' + imgs[counter++]);
            setTimeout('randomImages()', delay);
        }