function convertTemp(){
var d=document.forms["tempConvert"];
var inp=d.intemp.value;
if((inp!='')&&(!isNaN(inp))&&(inp!=Number.POSITIVE_INFINITY)&&(inp!=Number.NEGATIVE_INFINITY)){
inp=eval(inp);
switch(d.fromU.selectedIndex){
case 0: //C->K
inp=inp+273.15; break;
case 1: //F->K
inp=(inp+459.67)/1.8; break;
case 2: //R->K
inp=inp/1.8; break;
}
switch(d.toU.selectedIndex){
case 0: //K->C
inp=inp-273.15; break;
case 1: //K->F
inp=(inp*1.8)-459.67; break;
case 2: //K->R
inp=inp*1.8; break;
}
d.outtemp.value=(Math.round(inp*100)/100); //CHANGE THE 2nd NUMBER FOR MORE OR LESS ACCURACY
}else d.outtemp.value='(Invalid input)';
}