// JavaScript Document
function Valid()
{
  var tname=document.form1.txtName.value;
  if(tname == " " || tname.length==0 )
  {
    alert("Please Enter Your Name");
	document.form1.txtName.focus();
	return false;
   }	
   var femail=document.form1.txtEmail.value;
       if (femail.length != 0 || femail != " ")
       {
           if (echeck(document.form1.txtEmail.value)==false)
             {
	            femail.value=""
				alert("Enter your Valid E-mail Address");
	            document.form1.txtEmail.focus()
	             return false;
	          }
       }
	 var tcity=document.form1.txtCity.value;
	 if(tcity==" " || tcity.length==0)
	 {
	   alert("Please Enter your City");
	   document.form1.txtCity.focus();
	   return false;
	 }  
	 var tphone=document.form1.txtPhone.value;
	 if(tphone==" " || tphone.length==0)
	 {
	   alert("Please Enter your TelePhone no.");
	   document.form1.txtCity.focus();
	   return false;
	 } 
	 var tcom=document.form1.comment.value;
	 if(tcom==" " || tcom.length==0)
	 {
	   alert("Please Enter your Message");
	   document.form1.comment.focus;
	   return false;
	 }
}
function echeck(str) {

		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid E-mail ID")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1)
		 {
		    alert("Invalid E-mail ID")
		    return false
		 }
	  if (str.indexOf(" ")!=-1)
	  {
		 alert("Invalid E-mail ID")
		 return false
	  }
 	return true;	
}