function showBox(box){
   document.getElementById('yarn1').style.display = 'none';
   document.getElementById('yarn2').style.display = 'none';
   document.getElementById('yarn3').style.display = 'none';
   document.getElementById(box).style.display = 'block';
}

function showHideBlock(box){

   for(i = 1; i <= 100; i++){
      obj = document.getElementById('showHideBlock_'+i);
      if(obj){
         obj.style.display = 'none';
      }
   }
   
   document.getElementById(box).style.display = 'block';

}


function isZip(){
	var s = document.getElementById('shipZip').value;
	reZip = new RegExp(/(^\d{5}$)|(^\d{5}-\d{4}$)/);
	if(!reZip.test(s)){
		alert("Zip Code Is Not Valid, Try Again...");
		return false;
	}
	return true;
}