Banner Script - Show Title As Alt Instead Of Status

Using this banner script, how do I get the mouseover to display as an ALT, instead of in the status bar?

And the ('<a href="'+ ads[adNumber].href +'"
') needs to open the link in a new window.
example of the href url:
ads[i].href = "[URL]"
function getCode(adNumber){
var tempCode = ""
tempCode += ('<a href="'+ ads[adNumber].href +'" ')
tempCode += ('onMouseOver="status=''+ ads[adNumber].mouseover +'';return true" ')
tempCode += ('onMouseOut="status=''"> ')
tempCode += ('<img src="' + ads[adNumber].src + '" width=' + ads[adNumber].width)
tempCode += (' onLoad="setTimeout('newAd();',' + refreshTime + ');"')
tempCode += ('
height=' + ads[adNumber].height + ' border=0 >')
tempCode += ('</a>')
return tempCode;