function dome3calc(calcform) {
	if(document.calcform.radius.value == null || document.calcform.radius.value <= 0){
		alert("Radius must be a positive value");
              return} 
        document.result.struta.value = document.calcform.radius.value*.34862
        document.result.struta.value = document.result.struta.value.substring(0,5)
        
        document.result.strutb.value = document.calcform.radius.value*.40355
        document.result.strutb.value = document.result.strutb.value.substring(0,5)

        document.result.strutc.value = document.calcform.radius.value*.41241
        document.result.strutc.value = document.result.strutc.value.substring(0,5)
return   
}