Resolution URL contains-and number-does not conform to the standard problem _css/html

Today, in the site refactoring, encountered this problem, the URL needs to pass two variables (abc.asp?type=xxx&id=xxx), but added "&" after not through the test of the web, search for some did not find the results, had to check the English website checked, with " & A M P; " Instead of "&", we can solve this problem.
abc.asp?type=xxx& a M p;id=xxx
Simple translation of the reasons for failure to pass the test [:) English Ability Limited]
Because the 3.x version of Netscape is not compatible with this tag. Only if the "&" tag exists in the URL of the HTML, "& A M P" is required. Instead, when it is used as a special symbol, such as in the ASP, there is no need to replace.