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 The easiest way to demonstrate is with Shinies, since it's a true or false thing (this is called a boolean). You'll have to remove the spaces from the < script > bits and the < ! - - bits: < script type="text/javascript" >< ! - -function shinycheck(IDnum) {  var shinerate = 10;//        Change the number above to change the rate of Shiny appearances.//        Each dex has a 1-in-shinerate chance of being shiny; default is 1 in 10, or 10%.  var shinevalue = Math.floor(Math.random()*shinerate);//        ^ this multiplies 10 by a random number (Math.random) between 0 and 1, effectively making it 0-9. The Math.floor bit rounds it down - you need this. It turns all this into a value called shinevalue.  if (shinevalue == 0) {    document.write("<img src=" + IDnum + "s.gif>") ;//        If shinevalue is 0, it adds and s to the filename - PF's shinies are numbered like 112s.gif.  } else {    document.write("<img src=" + IDnum + ".gif>") ;//        and if it's not 0, it displays the normal image without the s.  }}// - - >< /script >All that should go within the < html > tags but outside the < body > tags.Where you want to display the image (inside < body > tags):< script type="text/javascript" >< ! - -shinycheck("016");// - - >< /script >< noscript ><img src=016.gif>< /noscript >The javascript calls the shinycheck function - that's what is above. If the person viewing the page doesn't have javascript active on their browser, the < noscript > tags display the image on its own.Feel free to ask if you have any more questions about this. I wrote this all in [ code ] tags because ezboard doesn't like people putting scripts on their forums.