//<!-- Start external javascript file contents - save as "search.js" --> 

//// Function retrieved from: http://cass-hacks.com/articles/code/js_url_encode_decode/  
//function URLEncode (clearString) {  
//  var output = '';  
//  var x = 0;  
//  clearString = clearString.toString();  
//  var regex = /(^[a-zA-Z0-9_.]*)/;  
//  while (x < clearString.length) {  
//    var match = regex.exec(clearString.substr(x));  
//    if (match != null && match.length > 1 && match[1] != '') {  
//        output += match[1];
//        x += match[1].length;  
//  }
//    else {  
//      if (clearString[x] == ' ')
//          output += '+'; 
//      else {  
//        var charCode = clearString.charCodeAt(x);  
//        var hexVal = charCode.toString(16);  
//        output += '%' + ( hexVal.length < 2 ? '0' : '' ) + hexVal.toUpperCase();  
//      }  
//      x++;  
//    }  
//  }  
//  return output;  
//}  
// Retrieved from: http://www.htmlcodetutorial.com/forms/index_famsupp_157.html  
function SubmitOnEnter(myfield, e)  
{   
    var keycode;  
    if (window.event)  
        keycode = window.event.keyCode;  
    else if (e)  
        keycode = e.which;  
    else
        return true;

    if (keycode == 13 && myfield.value != "")
    {
        SearchSite();  
        return false;  
    }
    else if (keycode == 13 && myfield.value == "")
    {
        return false;  
    }
     else
        return true;
}

//Left Trim
function ltrim(s) {
    return s.replace(/^\s*/, "");
}

function SearchSite(value) {

    var searchBox = ltrim(document.getElementById("q").value)

    if (searchBox != "") {
        document.location.href='http://www.netsupportschool.cz/search.aspx?cx=partner-pub-3912445207174996%3Aq766q5-vgxb&cof=FORID%3A11&ie=UTF-8&q=' + document.getElementById('q').value + '&sa=Search';  
        return true;
    }
    else
        document.getElementById("q").focus();
    return false;
}

<!-- End javascript -->