var myObj = null;

function showNextPage(currPage,nextPage){
    toggleView('IUPage'+currPage);
    toggleView('IUPage'+nextPage);
}

function toggleView(myPage){
    myObj = document.getElementById(myPage);
    if(myObj.className == "hide"){
       myObj.className = "show";
    }else{
       myObj.className = "hide"; 
    }
}