nav_square = new Image();
nav_square.src = 'http://www.convertunits.com/img/square.gif';
<!-- javascript functions
   function urlencode(value) {
      return value.replace(/ /g,"+");
   }
   function checknumber(i,unit) {
      if (!document.newunits.elements["u"+i].value.match(/[a-z']/i)) {
	 if (unit == '') {
	    alert("Please enter a unit name, not just a number.");
	    document.newunits.elements["u"+i].focus();
	 } else {
            document.newunits.elements["u"+i].value += " " + unit;
         }
      }
   }
   function newunits(form) {
      location = 'http://www.convertunits.com/from/' +
	 urlencode(form.u1.value) + '/to/' +
	 urlencode(form.u2.value);
      return false;
   }
// -->