function check(){
   if(document.callback1.mail.value=="")
		{
			alert("Plese enter the Email ID");
			document.callback1.mail.focus();
			return false;
		}

		if(document.callback1.mail.value)
		{
			email_val=validEmail(document.callback1.mail.value);
			if(email_val==1)
			{
				alert("Please enter valid Email ID");
				document.callback1.mail.focus();
				return false;
			}	
		}
  return true;
}
function check_phone(){
  if(document.callback.phone1.value=='')
      {
	   alert("Please enter Phone number");
	   document.callback.phone1.focus();
	   return false;
       }
	if(isNaN(document.callback.phone1.value))
	  {
       alert("Please enter Numerical Value for Phone Number");
	   document.callback.phone1.focus();
	   return false;
	   }   
  if(document.callback.phone2.value=='')
      {
	   alert("Please enter Phone number");
	   document.callback.phone2.focus();
	   return false;
       }
	   if(isNaN(document.callback.phone2.value))
	  {
       alert("Please enter Numerical Value for Phone Number");
	   document.callback.phone2.focus();
	   return false;
	   }   
   if(document.callback.phone3.value=='')
      {
	   alert("Please enter Phone number");
	   document.callback.phone3.focus();
	   return false;
       }
	   if(isNaN(document.callback.phone3.value))
	  {
       alert("Please enter Numerical Value for Phone Number");
	   document.callback.phone3.focus();
	   return false;
	   }   
  return true;   
}
function validEmail(str) {

		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		var email_check=0
		if (str.indexOf(at)==-1){
			email_check=1
		  // alert("Please enter a valid E-mail ID")
		   //return false
		}

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

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

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

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

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

 		 return email_check					
	}