使用现有代码只需添加一个简单的补丁
//first get the variables
bridge = namef & valuef
//a paranoid double check
if session("gap") = session("oldgap") then session("gap") = "null"
//the actual comparison
if bridge = session("gap") then
drawbridge = ""
else
drawbridge = inputscrubber("action")
end if
session("oldgap") = session ("gap")
session("gap") = namef & valuef