javascript change element size doesn't work properly -

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i'm trying create javascript function (onmouseover) increase elements height , width 10px (1px increase 10 times settimeout), instead element increases 200px in height , 100px in width. doesn't make sense. example on how it's not working properly: www.modwebsolutions.com/test3/ source code:

var el;  function changesize(id) {  var elem=document.getelementbyid(id);  el=elem;  (var i=0; i<10; i++) {     settimeout(changes,100); }  }  function changes() { var tempheight=el.offsetheight; var tempwidth=el.offsetwidth; el.style.height=tempheight + 1 +"px"; el.style.width=tempwidth + 1 + "px"; }   //    update: tried     el.style.height=(parseint(tempheight) + 1) +"px";     el.style.width=(parseint(tempwidth) + 1) + "px";

this time adds 50px height , still 100px width... instead of 10px each way.

update: seems i'm gonna have answer own question, i'm still not sure, think has iterations running ahead of settimeout , messing up. unfortunately seems settimeout can work ok in recursive functions.

update2: recursive approach doesn't work well... total dead end.

may because tempwidth , tempheight trated string should try...

el.style.height= (parseint(tempheight) + 1) +"px"; el.style.width= (parseint(tempwidth) + 1) + "px";

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