// JavaScript Document

function calculate() {

		var bw = new Array();
		bw[0] = 20; bw[1] = 34; bw[2] = 80; bw[3] = 125; bw[4] = 225; bw[5] = 300;

		if (document.calculator.seconds.value == "") document.calculator.seconds.value = 0;
		
		var minutes = eval(document.calculator.minutes.value * 60);
		var seconds = eval(document.calculator.seconds.value);
		var totaltime = (minutes + seconds);
		
		for (var i=0; i<6; i++) {
		
			var MbSize = 0;
			MbSize = eval((totaltime * bw[i]) / 8);
		
			if (MbSize <= 1024) {
		   	   document.calculator[i+2].value = MbSize + " k";
			} else if (MbSize > 1024) {
			   MbSize = MbSize/1024;
			   var MbSize2 = Math.floor(MbSize);
			   var tool = Math.round((MbSize*100+.5)%100);
			   var MbSize3 = tool / 100;
			   document.calculator[i+2].value = MbSize2 + MbSize3 + " MB";
			}
		}
	}