var myImg= new Array(26)
  myImg[0]= "71";
  myImg[1]= "70";
  myImg[2]= "69";
  myImg[3]= "68";
  myImg[4]= "67";
  myImg[5]= "66";
  myImg[6]= "65";
  myImg[7]= "64";
  myImg[8]= "63";
  myImg[9]= "62";
  myImg[10]= "61";
  myImg[11]= "60";
  myImg[12]= "59";
  myImg[13]= "58";
  myImg[14]= "57";
  myImg[15]= "56";
  myImg[16]= "55";
  myImg[17]= "54";
  myImg[18]= "53";
  myImg[19]= "52";
  myImg[20]= "51";
  myImg[21]= "50";
  myImg[22]= "49";
  myImg[23]= "48";
  myImg[24]= "47";
  myImg[25]= "46";
  myImg[26]= "45";
  myImg[27]= "44";
  myImg[28]= "43";
  myImg[29]= "42";
  myImg[30]= "41";
  myImg[31]= "40";
  myImg[32]= "39";
  myImg[33]= "38";
  myImg[34]= "37";
  myImg[35]= "36";
  myImg[36]= "35";
  myImg[37]= "34";
  myImg[38]= "33";
  myImg[39]= "32";
  myImg[40]= "31";
  myImg[41]= "30";
  myImg[42]= "29";
  myImg[43]= "28";
  myImg[44]= "27";
  myImg[45]= "26";
  myImg[46]= "25";
  myImg[47]= "24";
  myImg[48]= "23";
  myImg[49]= "22";
  myImg[50]= "21";
  myImg[51]= "20";
  myImg[52]= "19";
  myImg[53]= "18";
  myImg[54]= "17";
  myImg[55]= "16";
  myImg[56]= "15";
  myImg[57]= "14";
  myImg[58]= "13";
  myImg[59]= "12";
  myImg[60]= "11";
  myImg[61]= "10";
  myImg[62]= "9";
  myImg[63]= "8";
  myImg[64]= "7";
  myImg[65]= "6";
  myImg[66]= "5";
  myImg[67]= "4";
  myImg[68]= "3";
  myImg[69]= "2";
  myImg[70]= "1";

myImgSrc = "/images/Construction/";
myImgEnd = ".jpg"
var i = 0;

function loadImg(){
  document.mainimage.src = myImgSrc + myImg[i] + myImgEnd;
}

function prev(){
  if(i<1){
    var l = i
  } else {
    var l = i-=1;
  }
  document.mainimage.src = myImgSrc + myImg[l] + myImgEnd;
}

function next(){
  if(i>25){
    var l = i
  } else {
    var l = i+=1;
  }
  document.mainimage.src = myImgSrc + myImg[l] + myImgEnd;
}

window.onload=loadImg;