function Search()
{  
    var searchtxt = trim(document.getElementById('SearchTxt').value);
    var iChars = "!@#$%^*()+=-[]\\;,/{}|\":<>?~_"; 
       for (var i = 0; i < searchtxt.length; i++) {
        if (iChars.indexOf(searchtxt.charAt(i)) != -1) {
          alert ("Your string has special characters. \nThese are not allowed.");
          return false;
        }
      }
    if(searchtxt.length < 3)
    {
        alert ("Please input at least 3 characters to search.");
        return false;
    }
    else
    {
        location='/contents/list.aspx?keyword='+escape(searchtxt);
    }
}
function trim(str){
    return str.replace(/^\s\s*/, '').replace(/\s\s*$/, '');
}