function valid()
{				  
var i,j,k,s,diff,c;
if(document.form1.name.value=="")
{
	alert("Enter your name");
	return false;
}


if(document.form1.email.value=="")
{
	alert("Enter a valid email address");
	return false;
}
if(document.form1.email.value!="")
	{
		val=document.form1.email.value;
		s=val.indexOf(" ");
		i=val.indexOf('@');
		j=val.indexOf('.');
		diff=parseInt(j)-parseInt(i); 
		k=parseInt(j)+1;      
		c=val.charAt(k);
		if(i<1||diff<=1||c==""||s>=0)
		{
			alert("Enter a valid email address");
			document.form1.email.focus();
			return false;
		}
		
	}
	if(document.form1.comments.value=="")
{
	alert("Enter any comment");
	return false;
}

	return true;
}