//copyright 2003 Pipian for airhog.com

function fillcalc() 			//main function to calculate fills
{

	ts = document.form0.ts.value/1;		// Tank Size
	tf = document.form0.tf.value/1;		// Tank Fill Pressure
	gf = document.form0.gf.value/1;		// Gun Fill Pressure
	gs = document.form0.gs.value/1;		// Gun Size
	gr = document.form0.gr.value/1;		// Gun Refill Pressure

	fills=416010*ts*(tf-gf)/gs/(gf-gr)/(tf+14.7);
  if (isNaN(fills))
     {document.form0.fills.value=" - error - ";}
  else
	
	document.form0.fills.value = Math.round(fills);
}