function checkForm()
{
    var numericExpression = /^[0-9]+$/;
    var alphaExp = /^[a-zA-Z]+$/;
    var emailExp = /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*\.(\w{2}|(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum))/;
    var alphaExpCity = /^[a-zA-Z\s]+$/; 
    var name = /^[a-zA-Z\s\-\']+$/;   
    var address =  /^[{}()!%^=`~#$&<>,?\"':;*+?\\^$|\s\.]/;

  if(!document.form.fname.value.match(name) ||(document.form.fname.value==""))
  {
    	alert("Please enter your first name.");
		document.form.fname.focus();
		document.form.fname.value = "";
        return false;
     }
     
    if( !document.form.lname.value.match(name) ||(document.form.lname.value==""))
    {
    	alert("Please enter your last name");
		document.form.lname.focus();
		document.form.lname.value = "";
        return false;
     }
  
   
  if(!document.form.mm.value.match(numericExpression) || (document.form.mm.value == "")||(document.form.mm.value.length != 2))
 {
        alert("Please enter a valid birth month");
        document.form.mm.focus();
		document.form.mm.value = "";
		return false;
   }
 /* if(!document.form.dd.value.match(numericExpression) || (document.form.dd.value == "")||(document.form.dd.value.length != 2))
 {
        alert("Please enter a valid birth day");
        document.form.dd.focus();
		document.form.dd.value = "";
		return false;
   }
*/
   
   if(!document.form.yyyy.value.match(numericExpression) || (document.form.yyyy.value == "")||(document.form.yyyy.value.length != 4))
  {
    	alert("Please enter a valid birth year");
		document.form.yyyy.focus();
		document.form.yyyy.value = "";
        return false;
     }
    if(!document.form.email.value.match(emailExp) || (document.form.email.value == ""))
    {
    	alert("Please enter a valid email address.");
		document.form.email.focus();
		document.form.email.value = "";
        return false;
     }  
 
   if(document.form.school.value.match(numericExpression) || (document.form.school.value == ""))
  {
    	alert("Please enter a school");
		document.form.school.focus();
		document.form.school.value = "";
        return false;
     }
       if(document.form.captcha.value.match(numericExpression) || (document.form.captcha.value == ""))
  {
    	alert("Please enter a text from image");
		document.form.captcha.focus();
		document.form.captcha.value = "";
        return false;
     }
 
  

}