if(!focus()){self.focus();}

function ageCheck(form) {
	myage=form.age.value;
	
	if(myage > 99 || myage == "" || myage < 1 || !isNumeric(myage)) {
		alert("\nPlease enter a valid age.");
		form.age.focus();
		return false;	
	}  else {
	  	return true;
	}
}//end functon ageCheck

function isNumeric(input) {
    if(!parseFloat(input)) { 
        return false;
    } else {
        for (var i=0; i < input.length; i++) {
            if(input.charAt(i) != " ") {
                   if(!parseFloat(input.charAt(i)) && input.charAt(i) != "0") {
                    return false;
                   }
             }
         }// end for i
    }
    return true;
 } // end isNumeric