Unable to show images in javascript -

I am using javascript to show images. I have 5 images, but are unable to display them. My code is as follows:

  function set () {var i; (I = 1; i & lt; = 5; i ++) for {var image = "& lt; img src = images / sl + i + /> & gt;"; Document.getElementById ('Slider'). InnerHTML = Image; }} SetInterval ("set ()", "500"); & Lt; Div id = "slider" & gt; & Lt; Img src = "picture / SL1.jpg" /> & Lt; / Div & gt;    
 
 
 -  
  var image = "& Lt; img src = illustrations / SL + I + / & gt; ";   
 to -  
  var image = "& lt; img src = images / sl" + i + "/>";   
 In addition, I believe you have to attach image format to  (jpg | png etc)   
 Edit -  
  var image = "& lt; img src = images / sl" + i + ".jpg" + "style = 'width: 500px; height: 300px;' / & Gt; ";