function ValidChars(sText,ValidChars){var IsNumber=true;var Char;for(i=0;i<sText.length&&IsNumber==true;i++){Char=sText.charAt(i);if(ValidChars.indexOf(Char)==-1){IsNumber=false;}}
return IsNumber;}
function checkform(form){if(form.feet.value==""){alert("Please enter your height (feet)");form.feet.focus();return false;}
if(!ValidChars(form.feet.value,"0123456789")){alert("Please enter only numbers for your height (feet)");form.feet.focus();return false;}
if(form.inches.value==""){alert("Please enter your height (inches)");form.inches.focus();return false;}
if(!ValidChars(form.inches.value,"0123456789")){alert("Please enter only numbers for your height (inches)");form.inches.focus();return false;}
if(form.weight.value==""){alert("Please enter your weight");form.weight.focus();return false;}
if(!ValidChars(form.weight.value,"0123456789")){alert("Please enter only numbers for your weight");form.weight.focus();return false;}
if(!ValidChars(form.waist.value,"0123456789")){alert("Please enter only numbers for your waist size");form.waist.focus();return false;}}