Want to make my code more efficient

[chrisdab]

I have this part of my script which is pretty efficient at finding my target. I am trying to turn the second script, which is basically the same function, into an efficient script like the first one. I am learning javascript so I would like to make this a learning experience into writing optimized scripts.

if(thisPage=="The Hit List")
{
	var i, highestValue = boss.preferences.bounty_min, correspondingInput;
	var inputs = document.evaluate("//input[@value='attack']", document, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);
	for(i = inputs.snapshotLength - 1; i>=0; i--) 
	{
		checkVal = parseInt(inputs.snapshotItem(i).parentNode.parentNode.previousSibling.previousSibling.previousSibling.previousSibling.innerHTML.replace(/[\$,]/g, ""));
		if (checkVal < boss.preferences.bounty_max &&  checkVal > boss.preferences.bounty_min && checkVal > highestValue) 
		{
			highestValue = checkVal;
			correspondingInput = inputs.snapshotItem(i);
			reload = false;
		}	
	}
	if (correspondingInput) correspondingInput.click();
}

  if (Page.c_page=='hitlist')
    {
    var found = false;
    if (boss.jackpot_id)
      {
      var seek = Utils.getElementsByXPath('.//form[contains(@action,"http://apps.facebook.com/mobwars/fight/do.php")]');
      if (seek)
        {
        var x;
        for (it in seek)
          {
          var further = Utils.getElementsByXPath('.//input[contains(@name,"target_id")]',seek[it]);
          if (further)
            {
            if (further[0].value==boss.jackpot_id)
              {
              found = true;
              break;
              }
            }
          }
        }
      }

    if (!found)
      {
    	boss.jackpot_id = 0;
    	boss.jackpot = 0;
    	GM_setValue('boss', boss.toSource());
      }

    if (boss.preferences.hitlist_active && boss.stamina>0)
      {
      var content = document.getElementById('app8743457343_content');
      if (content) divs = content.getElementsByTagName('FORM');
      var target_acquired = 0;
      var first_target

      for (var i = 0; i < divs.length; i++)
        {
        var attack = divs[i].innerHTML.match(/attack/);
        if (!attack)
          {
          continue;
          }
        else
          {
          var highest = 0;
          var highest_target;
          var target_id = divs[i].getElementsByTagName('INPUT')[12].value;
          var bounty_id = divs[i].getElementsByTagName('INPUT')[13].value;
          var bounty = parseInt(dollars_to_int(divs[i].parentNode.parentNode.getElementsByTagName('TD')[2].innerHTML));

          var req1 = bounty > boss.preferences.bounty_min;
          var req2 = bounty < boss.preferences.bounty_max;
          var req3 = boss.preferences.bounty_min==0;
          var req4 = boss.preferences.bounty_max==0;
          var highest_target_id;
          var first_target_id;

          if ((req1 && req2) || (req1 && req4) || (req3 && req2) || (req3 && req4))
            {
        	  target_acquired++;

            // First Come First Serve
            if (boss.preferences.hitlist_order)
              { // first in-range target acquired
              first_target = 'http://apps.facebook.com/mobwars/fight/do.php?action=attack_bounty&target_id='+target_id+'&bounty_id='+bounty_id+'&from=/hitlist/index.php';
              first_target_id = target_id;
              break;
              }

            // Aim For Highest Bounty
            if (bounty > highest)
        	    { // target with more bounty acquried
              highest = bounty;
    	        highest_target = 'http://apps.facebook.com/mobwars/fight/do.php?action=attack_bounty&target_id='+target_id+'&bounty_id='+bounty_id+'&from=/hitlist/index.php';
    	        highest_target_id = target_id;
              }
      	    }
          }
        }

      if (target_acquired>0)
        {
        target_acquired--;
        boss.evaded = 0;
        boss.jackpot++;
        boss.targets = target_acquired;
        GM_setValue('boss', boss.toSource());
        if (boss.preferences.snipes>0)
          {
        	for (var snipers=1;snipers<boss.preferences.snipes;snipers++)
        	  {
        	  GM_xmlhttpRequest({method:'GET',url:(boss.preferences.hitlist_order?first_target:highest_target)}); // GM ajax snipe!
        	  }
          }
        document.location.href = (boss.preferences.hitlist_order?first_target:highest_target);
        return;
  		  }

      boss.jackpot = 0;
      GM_setValue('boss', boss.toSource());

      if (boss.preferences.aggressive)
        {
        if (divs.length>0)
          {
          boss.evaded++;
          }
         else
         	{
        	boss.evaded = 0;
         	}
        GM_setValue('boss', boss.toSource());
        if (boss.targets>0 && boss.evaded<=5)
          {
          window.location.reload();
          }
        else
          {
          window.location.href = "http://apps.facebook.com/mobwars/"+(boss.preferences.hurl?"":"hitlist/"); 
          }
        }
     else
        {
        if (boss.preferences.passive_refresh) window.setTimeout(function() { window.location.href = "http://apps.facebook.com/mobwars/"+(boss.preferences.hurl?"":"hitlist/") }, norm_refresh);
        }
   	  }
    }
  }

[diltony]

You can alwayz start your learning from javascriptkit.com, w3schools.com those are nice sites for beginners.