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					
	}
function validate_form(feedback)
{

if((feedback.name.value=="") || (feedback.name.value==null))	
{

alert("Please enter your name")	;
feedback.name.focus();
return false;
	
}

if(feedback.company.value=="")	
{
alert("Please enter company name");
feedback.company.focus();
return false;
	
}

if(feedback.email.value=="")	
{
alert("Please enter your email");
feedback.email.focus();
return false;
	
}
var emailID=document.feedback.email
	
	if ((emailID.value==null)||(emailID.value=="")){
		alert("Please Enter your Email ID")
		emailID.focus()
		return false
	}
	if (echeck(emailID.value)==false){
		emailID.value=""
		emailID.focus()
		return false
	}
	
if(feedback.address.value=="")	
{
alert("Please enter your Address")	;
feedback.address.focus();
return false;
	
}
if(feedback.message.value=="")	
{
alert("Please write your Feedback")	;
feedback.message.focus();
return false;
	
}

	
	
	
}