snum="345,231,56,786,1100,356,1200,300,685,111,134,765"  

function GetMax(str) 
num=split(str,",") 
max=num(0) 
for ii=0 to ubound(num) 
if cint(num(ii))>cint(max) then max=num(ii) 
response.Write "num="&num(ii)&",max="&max&"<br />" 
next 
GetMax=max 
end function 

response.Write "數組"&snum&"<br />最大值:"&GetMax(snum)