function decideConvert(temp, rh, pressure)
			{
				
				temp = parseFloat(document.Convert.Temp.value);
				pressure = parseFloat(document.Convert.StnPress.value);
	
				if(document.Convert.pressureunit[0].checked)
				{
					if(document.Convert.StnPress.value == "")
					{
						alert ('You must enter your station pressure and choose your units for the pressure');
					}	
					else
					{
					MBpressure = parseFloat(convertinHGtomb(pressure));
					}
				}
				
				
				if(document.Convert.pressureunit[1].checked)
				{
					if(document.Convert.StnPress.value == "")
					{
						alert ('You must enter your station pressure and choose your units for the pressure');
					}	
					else
					{
					MBpressure = parseFloat(convertmmHGtomb(pressure));
					}
				}
				
				if(document.Convert.pressureunit[2].checked)
				{
					if(document.Convert.StnPress.value == "")
					{
						alert ('You must enter your station pressure and choose your units for the pressure');
					}	
					else
					{
					MBpressure = pressure;
					}
				}
			
				
				
				if (document.Convert.tempunit[0].checked)
				{
					if (document.Convert.Temp.value == "")
					{
						alert ('You must enter your temperature and choose your units for the temperature');
					}
					else
					{
						Ctemp = parseFloat(convertFtoC(temp));
						
					}
				}

				if (document.Convert.tempunit[1].checked)
				{
					if (document.Convert.Temp.value == "")
					{
						alert ('You must enter your temperature and choose your units for the temperature');
						
					}
					else
					{
						Ctemp = temp;
						
					}
				}
				
				if (document.Convert.tempunit[2].checked)
				{
					if (document.Convert.Temp.value == "")
					{
						alert ('You must enter your temperature and choose your units for the temperature');
					}
					else
					{
						Ctemp = parseFloat(convertKtoC(temp));
						
					}
				}
				
				if (document.Convert.RH.value == "")
					{
						alert ('You must enter your relative humidity');
					}
					else
					{
					if (rh > 100 )
					{
						alert('Your RH is greater than 100%.  RHs greater than 100% do not normally occur in the atmosphere.  This supersaturated script will now evaporate');
					}
					else
					{
						rh = parseFloat(document.Convert.RH.value);						
					}
				
				}
				
				
			
			var Es, E, dewpoint;
			
			Es = parseFloat(esubs(Ctemp));
			E = parseFloat(invertedRH(Es,rh));
			dewpoint = (Dewpoint(E));
						
			document.Convert.DewpointF.value = parseFloat(roundOff(convertCtoF(dewpoint)));
			document.Convert.DewpointC.value = roundOff(dewpoint);
			document.Convert.DewpointK.value = parseFloat(roundOff(convertCtoK(dewpoint)));
	
			
			E2 = parseFloat(invertedRH(Es,rh));
			Twguess = 0;
			incr = 10;
			previoussign = 1;
			Edifference = 1;
			
			wetbulb = calcwetbulb(Edifference,Twguess,Ctemp,MBpressure,E2,previoussign,incr);
			document.Convert.WetbulbF.value = parseFloat(roundOff(convertCtoF(wetbulb)));
			document.Convert.WetbulbC.value = roundOff(wetbulb);
			document.Convert.WetbulbK.value = parseFloat(roundOff(convertCtoK(wetbulb)));
							
		}			
	
			
			function convertFtoC(Fahr)
			{
				var Cels;
				Cels = .55556 * (Fahr - 32);
				return Cels;
			}

			function convertKtoC(Kel)
			{
				var Cels;
				Cels = Kel - 273.15;
				return Cels;
			}
			
			function convertCtoF(Cels)
			{
				var Fahr;
				Fahr = 1.8 * Cels + 32;
				return Fahr;
			}
			
			function convertCtoK(Cels)
			{
				var Kelvin;
				Kelvin = Cels + 273.15;
				return Kelvin;
			}
			
			function convertinHGtomb(inHG)
			{
				var mb;
				mb = 33.8639*inHG;
				return mb;
			}
			
			function convertmmHGtomb(mmHG)
			{
				var mb;
				mb = 1.333224*mmHG;
				return mb;
			}

			function esubs(Ctemp)
			{
				var Es;
				Es = 6.112 * Math.exp(17.67 * Ctemp / (Ctemp + 243.5));
				return Es;
			}
			
			function invertedRH(Es,rh)
			{
				var E;
				E = Es * (rh/100);
				return E;
			}
						
			function Dewpoint(E)
			{
				var Dewpoint;
				Dewpoint = (243.5 * Math.log(E/6.112))/(17.67 - Math.log(E/6.112));
				return Dewpoint;
			}
			
			function calcwetbulb(Edifference,Twguess,Ctemp,MBpressure,E2,previoussign,incr)
			{
				outerloop:
				while (Math.abs(Edifference) > 0.05) 
				{
					Ewguess = 6.112 * Math.exp((17.67 * Twguess) / (Twguess + 243.5));
					Eguess = Ewguess - MBpressure * (Ctemp - Twguess) * 0.00066 * (1 + (0.00115 * Twguess));
					Edifference = E2 - Eguess;
					
					if (Edifference == 0)
					{
						break outerloop;
					} else {
						if (Edifference < 0)
						{
							cursign = -1;
							if (cursign != previoussign)
							{
								previoussign = cursign;
								incr = incr/10;
							} else {
								incr = incr;
							}
						} else {
							cursign = 1;
							if (cursign != previoussign)
							{
								previoussign = cursign;
								incr = incr/10;
							} else {
								incr = incr;
							}
						}
					}
					
					Twguess = Twguess + incr * previoussign;
					
				}
				wetbulb = Twguess;
				return wetbulb;
			}			
						
			function roundOff(value)
			{
				value = Math.round(100*value)/100;
				return value;
			}
						
			function roundOff(value)
			{
				value = Math.round(100*value)/100;
				return value;
			}
			
			function setToNull()
			{
				
				document.Convert.DewpointF.value="";
				document.Convert.DewpointC.value="";
				document.Convert.DewpointK.value="";
				document.Convert.WetbulbF.value="";
				document.Convert.WetbulbC.value="";
				document.Convert.WetbulbK.value="";
				document.Convert.RH.value="";
				document.Convert.StnPress.value="";
				document.Convert.Temp.value="";
			}