function validate(form)
{ 
	//validation for Userid and it shud start with char
	
	if(form.name.value=="")
	{
		alert("Wait! Please include your name");
		form.name.focus();
		return false;
	}
	else
	{
		var ch=form.name.value.charAt(0);
		for (i=0; i<=9; i++)
		{
			if (ch==i)
			{
				alert("Name must start with character");
				form.name.focus();
				return false;
			}
		}
	}
	
	
	//Validation for Valid EmailID
	if( form.email.value=="")
		{
			alert("Wait! Please include your email address.");
			form.email.focus();
			return false;
		}
	else	
		{	
			apos=form.email.value.indexOf("@")
			dotpos=form.email.value.lastIndexOf(".")
			if (apos<1||dotpos-apos<2||dotpos==(form.email.value.length)-1) 
			  {
			  alert("Inavalid emailid");
			  form.email.focus();
			  return false;
			  }
		 }
			 if( form.comments.value=="")
		    { 
			 alert("Wait! Please include your comments.");
			 form.comments.focus();
			 return false;
		   }
		if(form.checkbox.checked)
		{
		
		var temp1 = new Array();
		var temp2 = new Array();
		var name = form.name.value;
		var email = form.email.value;	
		var name_email = form.name_email.value;
		temp1 = name_email.split(",");
		for(var i=0;i<temp1.length;i++)
		{
		temp2 = temp1[i].split(":");
		if(temp2[0]!='' && temp2[1]!='')
		{
		//alert(temp2[0]+'=='+name+' and '+temp2[1]+'=='+email);
		if(temp2[0]==name && temp2[1]==email)
		{
		alert("Hey! It looks like you're already in Jeb's Club");
		form.name.focus();
		return false;
		}
		}
		}
		}
}