function resetField(obj,str){
	if(obj.value.length==0){
		obj.value=str;
		return;
	}
	if(obj.value==str){
		obj.value="";
	}
}

function populateTokenStack(exp)
{
  _tokens = new Array();
  var size = exp.length;
  var retExp = '';
  var inQuotedToken = false;
  var tokenEnded = false;
  var wasQuotedToken = false;
  var currentToken = '';
  var lastToken = '';
  for(i=0;i<size;i++) {
    ch = exp.charAt(i);

    if(ch=='"') {
      tokenEnded = true;
      if(inQuotedToken) {
        inQuotedToken = false;
        wasQuotedToken =  true;
      } else {
        inQuotedToken = true;
      }
    } else if(isParenthesis(ch) || ch==' ') {
      if(inQuotedToken) {
        currentToken=currentToken+ch;
      } else {
        tokenEnded = true;
      }
    } else {
      currentToken=currentToken+ch;
    }

    if(tokenEnded) {
      if(currentToken.length>0 && currentToken!= ' ') {
        if(!isOperator(currentToken)) {
          populateKeywords(currentToken);
          insertAnd();
        }
        if(wasQuotedToken) {
          currentToken = '"' + currentToken + '"';
          wasQuotedToken = false;
        }
        pushToken(currentToken);
      }
      if(ch=='(' || ch==')')
        pushToken(ch);

      currentToken = '';
      tokenEnded=false;
    }

    if(ch!='"')
      retExp= retExp+ ch;
  }

  lastToken = currentToken;
  if(currentToken.length>0 && currentToken!= ' ') {
    if(!isOperator(currentToken)) {
      populateKeywords(currentToken);
      insertAnd();
    }

    pushToken(currentToken);
  }
  currentToken = '';
  return _tokens;
}

function pushToken(currentToken)
{
  _tokens[_tokens.length] = currentToken;
}

function populateKeywords(keyword)
{
  if(keywords.length == 0)
    keywords += keyword;
  else
    keywords += "$" + keyword;
}

function isOperator(str)
{
  if(str.toLowerCase()=='and' || str.toLowerCase()=='not' || str.toLowerCase()=='or')
    return true;
  else
    return false;
}

function isParenthesis(str)
{
  if(str=='(' || str==')')
    return true;
  else
    return false;
}

function isPhrase(str)
{
  if(str.charAt(0) == '"')
    return true;
  else
    return false;
}

function insertAnd()
{
  var keepPopping = true;
  var count = 0;
  var poppedTokens = new Array();
  var sz = _tokens.length;
  if(sz==0)
    return;

  while(keepPopping && count<sz) {
    poppedTokens[count] = _tokens[sz-count-1];

    if(poppedTokens[count]!='(')
      keepPopping = false;
    count++;

  }
  if(!keepPopping) {
    //check last popped token
    var lastPoppedToken = poppedTokens[count-1]
    if(lastPoppedToken==')' || (lastPoppedToken.toLowerCase()!='and' && lastPoppedToken.toLowerCase()!='or' && lastPoppedToken.toLowerCase()!='not')) {
      _tokens[sz-count+1] = 'and';
      for(j=1;j<count;j++)
        _tokens[sz-count+1+j] = poppedTokens[count-j-1]
    }
  }
}

function validateExp(exp)
{
  try
  {
    var retValue = eval(exp);
    return true;
  }
  catch(exception )
  {
    return false;
  }

}



function expandAndValidate(exp)
{
  var tokens = populateTokenStack(exp);
  var booleanStr ='';
  expandedStr = '';
  var sz = tokens.length;
  for(i=0;i<sz;i++) {
    var token = tokens[i];
    if(isOperator(token)) {
      booleanStr = booleanStr + ' && ';
      if(token.toLowerCase() == 'not') {
        expandedStr = expandedStr + ' ' + 'and ' + token.toLowerCase() + ' ';
      } else {
        expandedStr = expandedStr  + ' '+ token.toLowerCase() + ' ';
      }
    } else if(isParenthesis(token)) {
      booleanStr = booleanStr + token;
      expandedStr = expandedStr  + ' '+ token + ' ';
    } else {
      booleanStr = booleanStr + ' true ';
      if(isPhrase(token)) {
        expandedStr = expandedStr  + ' &wtquote;' + token + '&wtquote; ';
        //expandedStr = expandedStr  + ' ' + token + ' ';
      } else {
        // Add an encoded styring as suffix and prefix to tokens
        // that are none phrases.
        // These suffix, prefix will be converted to double quote for
        // ntext column and removed for other column types
        expandedStr = expandedStr  + ' &wtquote;' + token + '&wtquote; ';
      }
    }
  }
  //alert(booleanStr);
  //alert(expandedStr);
  if(validateExp(booleanStr)) {
    return true;
  } else {
    return false;
  }

}

function basicSearchSubmit()
{ 
  if(verify()) {
    document.getElementById("mainsearch").submit();
  }
}

function replaceSpecialChars(str)
{
  var retVal = str.replace(/[$#^_]/g,"");
  return retVal;
}

function verify()
{
  keywords = '';
  var searchStr = document.getElementById("mainsearch").searchString.value;
  searchStr = replaceSpecialChars(searchStr);
  document.getElementById("mainsearch").searchString.value = searchStr;
  if(expandAndValidate(searchStr)) {
    document.getElementById("mainsearch").BOOL_SEARCHSTRING.value = expandedStr;
    document.getElementById("mainsearch").KEYWORDS.value = keywords.replace(/ /g, "$");
    return true;
  } else {
    return false;
  }
  
  return true;
}

function answer()
{
    var count = document.unansweredquestions.unansweredquestionscount.value;
    if (count == 1)
    {
        document.form1.submit();
    }
}

function escalateViaEmail()
{
    document.frmemailescalate.submit();
}

function showLink(url)
{
    var win = window.open(url, 'showLink','resizable=1, scrollbars=1, height=' + screen.height * 2 / 3 + ', width=' + screen.width * 2 / 3 + ', left=' +screen.width * 1 / 6 + ', top=' + screen.height * 1 / 6);
}
// Question filters
var arrList = new Array();
// Build the array for the filter list
function initArrayList(obj)
{

	var formObj = document.getElementById(obj);
	for (i=0;i<formObj.options.length;i++)
	{
		var optionObj = new Object;
		optionObj.value = formObj.options(i).value;
		optionObj.text = formObj.options(i).innerText;
		//arrList[i] = formObj.options(i).innerText;
		arrList[i] = optionObj;
    }
}
function setfilter(obj)
{
    // this function filters drop down lists
    // an array of all possible values is stored as a variable
    // this arrary is searched for a text match
    // all items in the drop down list are removed
    // any values in the array matching the text string are added back in

    var sFilter = obj.value;
    var sFilterName = obj.name;
    sFilter = sFilter.toUpperCase();
    var sValue = "";
	var sText = "";
    var objProblemType = document.getElementById(sFilterName.substring(9));
    var iCount = objProblemType.options.length;
	var oOption;
    for (i=0;i<iCount;i++)
    {
		if (objProblemType.options(0) != null) {
			objProblemType.options.remove(0);
		}
    }
    if (sFilter.length > 0)
    {
        for (i=0;i<arrList.length;i++)
        {
	        sValue = arrList[i].text;
            sValue = sValue.toUpperCase();
            if (sValue.indexOf(sFilter) != -1)
            {
	            oOption = document.createElement("OPTION");
                oOption.text = arrList[i].text;
                oOption.value = arrList[i].value;
                objProblemType.options.add(oOption);
            }
        }
    } else {
        for (i=0;i<arrList.length;i++)
        {
            oOption = document.createElement("OPTION");
            oOption.text = arrList[i].text;
            oOption.value = arrList[i].value;
            objProblemType.options.add(oOption);
        }
    }
}

function clearFilterTextBox(obj, str)
{
    if (obj.value == str)
    {
        obj.value = "";
    }
}