function validate()
{   
    var count = 1;

    if(document.getElementById('firstname').value == '')
    {
        document.getElementById('firstname1').style.display = 'inline';
        count = 0;
    }
    else
    {
        document.getElementById('firstname1').style.display = 'none';
    }


    if(document.getElementById('lastname').value == '')
    {
        document.getElementById('lastname1').style.display = 'inline';
        count = 0;
    }
    else
    {
        document.getElementById('lastname1').style.display = 'none';
    }
    
    email = document.getElementById('email').value;    
      
    if(emailCheck(email) == false)
    {
        document.getElementById('email1').style.display = 'inline';
        count = 0;
    }
    else
    {
        document.getElementById('email1').style.display = 'none';
    }
    
    if(document.getElementById('vehiclemake').value == '')
    {
        document.getElementById('vehiclemake1').style.display = 'inline';
        count = 0;
    }
    else
    {
        document.getElementById('vehiclemake1').style.display = 'none';
    }
    
    if(document.getElementById('vehiclemodel').value == '')
    {
        document.getElementById('vehiclemodel1').style.display = 'inline';
        count = 0;
    }
    else
    {
        document.getElementById('vehiclemodel1').style.display = 'none';
    }

    year = document.getElementById('year').value;       
    
    if(isInteger(year) == false || year.length != 4)
    {
        document.getElementById('year1').style.display = 'inline';
        count = 0;
    }
    else
    {
        document.getElementById('year1').style.display = 'none';
    }
    
    telephone = document.getElementById('telephone').value;       
    
    if(telephone == '')
    {
        document.getElementById('telephone1').style.display = 'inline';
        count = 0;
    }
    else
    {
        document.getElementById('telephone1').style.display = 'none';
    }

    if(count == 0)
    {
        return false;
    }
    
    return true;
}



function emailCheck(str) 
{

        var at="@"
        var dot="."
        var lat=str.indexOf(at)
        var lstr=str.length
        var ldot=str.indexOf(dot)
        if (str.indexOf(at)==-1){
           return false
        }

        if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
           return false
        }

        if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
            return false
        }

         if (str.indexOf(at,(lat+1))!=-1){
            return false
         }

         if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
            return false
         }

         if (str.indexOf(dot,(lat+2))==-1){
            return false
         }
        
         if (str.indexOf(" ")!=-1){
            return false
         }

         return true                    
}

/* Validate number */    
    
   function isInteger (s)
   {
      var i;

      if (isEmpty(s))
      if (isInteger.arguments.length == 1) return 0;
      else return (isInteger.arguments[1] == true);

      for (i = 0; i < s.length; i++)
      {
         var c = s.charAt(i);

         if (!isDigit(c)) return false;
      }

      return true;
   }

   function isEmpty(s)
   {
      return ((s == null) || (s.length == 0))
   }

   function isDigit (c)
   {
      return ((c >= "0") && (c <= "9"))
   }