function evalSearch(){
 if(frmCheck()){
 
  if(document.frmSearch.SearchMenu.options[document.frmSearch.SearchMenu.selectedIndex].value=="0"){
   ret=window.open('http://www.google.com/search?q=' +  escape(document.frmSearch.txtKeyword.value) + '&domains=nus.edu.sg&sitesearch=nus.edu.sg');
  }
  else if(document.frmSearch.SearchMenu.options[document.frmSearch.SearchMenu.selectedIndex].value=="1"){
   ret=window.open('http://www.google.com/search?q=' +  escape(document.frmSearch.txtKeyword.value) + '&btnG=Google+Search');
  }
  else if(document.frmSearch.SearchMenu.options[document.frmSearch.SearchMenu.selectedIndex].value=="2"){
   ret=window.open('https://aces01.nus.edu.sg/NASApp/vocInternetStaffSearchAPP/departmentstaffindex.jsp?SearchValue=' +  escape(document.frmSearch.txtKeyword.value) + '&SearchCriteria=NAME'  );
  }
  else if(document.frmSearch.SearchMenu.options[document.frmSearch.SearchMenu.selectedIndex].value=="3"){
   ret=window.open('http://www.nus.edu.sg/search/index.php?SearchValue=' +  escape(document.frmSearch.txtKeyword.value) );
  }
  
 }
}
 
function frmCheck(){
 if(document.frmSearch.txtKeyword.value==""){
  alert("Please enter a search keyword");
  return false;
 }
 return true;
}


function preload(name, first, second) {  
// preload images and place them in an array
if (browserOK) {     
    pics[objCount] = new Array(25);
    pics[objCount][0] = new Image();
    pics[objCount][0].src = first;
    pics[objCount][1] = new Image();
    pics[objCount][1].src = second;
    pics[objCount][2] = name;
    objCount++;
  }
}

function on(name){
if (browserOK) {
     for (i = 0; i < objCount; i++) {
      if (document.images[pics[i][2]] != null)
        if (name != pics[i][2]) { 
          // set back all other pictures
          document.images[pics[i][2]].src = pics[i][0].src;
        } else {
           // show the second image because cursor moves across this image
           document.images[pics[i][2]].src = pics[i][1].src;
        }
    }
  }
}

function off(){
if (browserOK) {
     for (i = 0; i < objCount; i++) {
      // set back all pictures
      if (document.images[pics[i][2]] != null) 
        document.images[pics[i][2]].src = pics[i][0].src;
    }
  }
}