is there a way to create a loop that runs forever in the background and updates a text field on the website? when i type in doevents it highlights it like its a keyword but gives a script error when loading the page

i want to make a countdown in vbscript thats accurate to a second and counts down in real time and just places the count in a FONT tag, the only thing i need is how to perform the loop without locking up the webpage

thanks