function mail(email)
{    var i=0,attherate=0,dot=0,special=0,e=1;
     len= email.length;
     for(i=0;i<len;i++)
      {
        if((email.charAt(i).toUpperCase() >= 'A') && (email.charAt(i).toUpperCase() <= 'Z') || ((email.charAt(i) == '@') && (attherate==0) && (special==0)) || ((email.charAt(i) == '.') && (special==0) && (i<len-2)) || (email.charAt(i) == '_' ) || ((email.charAt(i) >= '0') && (email.charAt(i) <= '9')))  
         {
	   if(i==0)
	    {
             if((email.charAt(0).toUpperCase() < 'A') || (email.charAt(0).toUpperCase() > 'Z'))
               {
                  e=0;
                  break;
               }
	    }
	   else
	    {
             if(email.charAt(i) == '@') 
              {
		  attherate = 1;
		  dot=0; 
		  special=1;
              }
	     else
	      {
	             if(email.charAt(i) == '.')
        	      {
			  dot = 1; 
			  special=1;
		      }
		    else
			special=0;
	      }
	    }
            
         }
        else
          {
             e=0;
             break;
          }
      }
    if((attherate == 0) || (dot ==0) || (e==0))
	return(false);
    else
	return(true);
}