function checkItems() {
  var u,l;
  var table=document.getElementsByTagName("table");	  
  for (u=0; u<table.length; u++) {
    if (table[u].className=='specs-wide') {
	  tr=table[u].getElementsByTagName("tr");
	  doEven(tr);
    }
	 if (table[u].className=='specs') {
	  tr=table[u].getElementsByTagName("tr");
	  doEven(tr);
    }
	 if (table[u].className=='specs-two') {
	  tr=table[u].getElementsByTagName("tr");
	  doEven(tr);
    }
  }
}

function doEven(myRows) {
  for (l=0; l<tr.length; l++) {
    if (l%2==0) { tr[l].setAttribute('class', 'alter'); tr[l].setAttribute('className', 'alter'); } 
  }
}

function addLoadEvent(func) {
var onloadBak=window.onload;
  if (typeof window.onload!='function') { window.onload=func; } 
  else {
    window.onload=
	function() {
      onloadBak();
      func();
    }
  }
}

addLoadEvent(checkItems);