"

From 2014.igem.org

function Buttons(p) {

   var leftButton = document.getElementById("left_button");
   var rightButton = document.getElementById("right_button");
   var page = p;

/**@description These functions cause the Buttons on the page to change the SubPage when clicked.**/

leftButton.onclick=function(){

   page.turnPage(-1);
   updateButtons(page.getSubPageNum());

};

rightButton.onclick=function(){

   page.turnPage(1);
   updateButtons(page.getSubPageNum());

};

this.updateButtons = function(subPageNum) {

   if(subPageNum == 1) {
       leftButton.style.visibility = "hidden";
       rightButton.style.visibility = "visible";
   }
   else if(subPageNum == page.getMaxSubPage()) {
       leftButton.style.visibility = "visible";
       rightButton.style.visibility = "hidden";
   }
   else {
       leftButton.style.visibility = "visible";
       rightButton.style.visibility = "visible";
   }

}; }