Javascript Problem! Not changing the css style -

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i have code in javascript:

function change() {          document.getelementbyid("mem").classname = 'gif';  }

the fig , gif this:

a.fig {  background: #ffffff;  }  a.gif {  background: #000099  ; }

and function used 

<a class ="fig" id ="mem" onclick="javascript:change()" href="users" >

where difference between gif , fig in css have different background colors. problem change noticeable in second , not permanent!

any ideas?

function change() { var mem = document.getelementbyid("mem");     if (mem.classname == 'fig') {         mem.classname = 'gif';     }     else {         mem.classname = 'fig';     } }

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