function check_form()

{

  var f = document.signup; 
  
		if((f.fname.value.replace(/ /g, '')==""))
		{
		alert("Please enter your name.");
		f.fname.focus();
		return false;
		}
	
	  if ((f.email.value.replace(/ /g, '')=="") || (f.email.value=="Email:"))
	{
		alert("Please enter your email ID");
		f.email.focus();
		return false;	
	}
	
	
	if (f.email.value.match(/^([\w\-]+\.?)+\@([\w\-]+\.{1})+(com|net|org|edu|int|mil|gov|biz|info|aero|museum|name|coop|\w{2})$/) == null) 
	{ 
		alert("First enter a valid email ID"); 
		f.email.focus(); 
		return false; 
	}
	
	else
		//document.book.action = "book-mail.php";

return true;		
				
}

function isNumberKey(evt)
{
  var charCode = (evt.which) ? evt.which : event.keyCode
   if (charCode == 46)
  	return charCode;
  if (((charCode >= 33) && (charCode <= 47)) || ((charCode >= 58) && (charCode<=255)))
  {
  		if(evt.which)
		{
			evt.preventDefault();
		}
		else
		{
			evt.returnValue=false;
		}
  }else
  {
		
		return charCode;
  }
  
}

function isNumber(v)
   {
       var i;
       if(v.length==0)
               return false;
       for(i=0;i<v.length;i++)
               if( !(v.charAt(i)>="0" && v.charAt(i)<="9"))
                       return false;
       return true;
   }