function validate_required(field,alerttxt)
{
with (field)
{
if (value==null||value=="")
  {alert(alerttxt);return false}
else {return true}
}
}function validate_form(thisform)
{
with (thisform)
{
if (validate_required(txtSearch,"Please Enter a Search Term")==false)
  {txtSearch.focus();return false}
}
}

var xmlHttp

function showChoices(str, idx, selected)
{ 
xmlHttp=GetXmlHttpObject()
if (xmlHttp==null)
 {
 alert ("Browser does not support HTTP Request")
 return
 }
var url="../store/showChoices.php"
url=url+"?q="+str
url=url+"&i="+idx
url=url+"&s="+selected
url=url+"&sid="+Math.random()
xmlHttp.onreadystatechange=stateChanged 
xmlHttp.open("GET",url,true)
xmlHttp.send(null)
}

function stateChanged() 
{ 
if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
 { 
 document.getElementById("colours").innerHTML=xmlHttp.responseText 
 } else { 
  document.getElementById("colours").innerHTML='<img src="../img/loading.gif" />'  
 }
}

function GetXmlHttpObject()
{
var xmlHttp=null;
try
 {
 // Firefox, Opera 8.0+, Safari
 xmlHttp=new XMLHttpRequest();
 }
catch (e)
 {
 //Internet Explorer
 try
  {
  xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
  }
 catch (e)
  {
  xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
 }
return xmlHttp;
}