This is my guess but dont trust me I am new at this:

Code:
function run()
{
  vars Close = series(priceClose());
  vars SMA200 = series(SMA(Close,200));
  vars SMA20 = series(SMA(Close,20));
  vars Price_diff200 = series(abs((*Close - *SMA200)/ (*Close))  * 100.0);
  

  
  if(*Price_diff200 > 2.0)
	  if(SMA20 < SMA200)
		  enterLong();
      else if(SMA20 > SMA200)
			enterShort();
}