function overallSearchMouseOver()
{
  var theSearchField = document.getElementById("textfield3");
  var theSearchSelect = document.getElementById("select7");
  var theOverallA = document.getElementById("_aOverallSearch");
  var theSelectedValue = theSearchSelect.options[theSearchSelect.options.selectedIndex].value;
  var src="";
  var flag=parseInt(theSelectedValue); 
 switch(flag)
  {
     case 1:src=document.domain+"/buy.aspx";break;
     case 2:src=document.domain+"/travel/travel_Index.aspx";break;
     case 3:src=document.domain+"/repast/canyin.aspx";break;
     case 4:src=document.domain+"/house.aspx";break;
     default:src=document.domain+"/Default.aspx";break;
  }
 
  theOverallA.href = "http://"+src+"?keyword=" + encodeURI(theSearchField.value);
}