function dome1calc(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*1.05146
        document.result.struta.value = document.result.struta.value.substring(0,5)
        return   
}