function goSearch(searchOptionTarget, searchTarget, professionTarget)
{
	var searchOption1 = eval("document.checkForm." + searchOptionTarget + "[0].value");
	var searchOption2 = eval("document.checkForm." + searchOptionTarget + "[1].value");
	var search = eval("document.checkForm." + searchTarget + ".value");
	var profession = eval("document.checkForm." + professionTarget + ".value");
	
	if (profession == "" && search == "")
	{
	    alert("Please enter search terms");
    }
    else if (profession == "")
	{
		alert("Please choose a profession");
    }
    else if (document.checkForm.searchOption[0].checked == true && search == "")
	{
		alert("Please enter a name");
    }
    else if (document.checkForm.searchOption[0].checked == true && search != "")
    {
        var re = new RegExp("^[A-Za-z- ']*$");
        if (search.match(re)) {
            return true;
        }
        else {
            alert("Please enter a name, only alphabetical characters, hyphens and apostrophe allowed");
        }
    }
    else if (document.checkForm.searchOption[1].checked == true)
    {
        var searchTest = search.toUpperCase().replace(profession, "");
        var re = new RegExp("^[0-9]*$");

        if (searchTest == "") {
            alert("Please enter a registration number");
        }
        else if (searchTest.match(re)) {
            return true;
        }
        else {
            alert("'Please enter a valid registration number (e.g. PH04988)");
        }
    }
    else
    {
        return true;
    }
    return false;
}
  
// this function is needed to work around 
  // a bug in IE related to element attributes
  function hasClass(obj) {
     var result = false;
     if (obj.getAttributeNode("class") != null) {
         result = obj.getAttributeNode("class").value;
     }
     return result;
  }   

 function stripe(id) {

    // the flag we'll use to keep track of 
    // whether the current row is odd or even
    var even = false;
  
    // if arguments are provided to specify the colours
    // of the even & odd rows, then use the them;
    // otherwise use the following defaults:
    var evenColor = arguments[1] ? arguments[1] : "#fff";
    var oddColor = arguments[2] ? arguments[2] : "#eee";
  
    // obtain a reference to the desired table
    // if no such table exists, abort
    var table = document.getElementById(id);
    if (! table) { return; }
    
    // by definition, tables can have more than one tbody
    // element, so we'll have to get the list of child
    // <tbody>s 
    var tbodies = table.getElementsByTagName("tbody");

    // and iterate through them...
    for (var h = 0; h < tbodies.length; h++) {
    
     // find all the &lt;tr&gt; elements... 
      var trs = tbodies[h].getElementsByTagName("tr");
      
      // ... and iterate through them
      for (var i = 0; i < trs.length; i++) {

        // avoid rows that have a class attribute
        // or backgroundColor style
        if (! hasClass(trs[i]) &&
            ! trs[i].style.backgroundColor) {
 		  
          // get all the cells in this row...
          var tds = trs[i].getElementsByTagName("td");
        
          // and iterate through them...
          for (var j = 0; j < tds.length; j++) {
        
            var mytd = tds[j];

            // avoid cells that have a class attribute
            // or backgroundColor style
            if (! hasClass(mytd) &&
                ! mytd.style.backgroundColor) {
        
              mytd.style.backgroundColor =
                even ? evenColor : oddColor;
            
            }
          }
        }
        // flip from odd to even, or vice-versa
        even =  ! even;
      }
    }
  }