function ShowHide(SelectEvent){
  var i=0;
  var ShowHide;
  var triangleImage;
  
  for (i=1;i<=9;i++){
    ShowHide = "d" + i;
    BGImage = "divHeader" + i;
    
    //document.getElementById(triangleImage).style.backgroundImage = "url(Images/Global_Images/gradientblock2Show.jpg)";
    if(i==SelectEvent){
     document.getElementById(ShowHide).style.display = "block";
     document.getElementById(BGImage).style.backgroundImage = "url(Images/Performances_Page/gradientblockSelected.jpg)";
     document.getElementById(BGImage).style.color = "white";
    }else{
      document.getElementById(ShowHide).style.display = "none"; 
      document.getElementById(BGImage).style.backgroundImage = "url(Images/Performances_Page/gradientblock.jpg)";
      document.getElementById(BGImage).style.color = "White";
    }
  }
}