// JavaScript Document
function validate()
{
if(document.form1.txtname.value =='')
{
alert("Please enter name");
document.form1.txtname.focus();
return false;
}
if(document.form1.txtphone.value =='')
{
alert("Please enter mobile no.");
document.form1.txtphone.focus();
return false;
}if(document.form1.txtemail.value =='')
{
alert("Please enter email");
document.form1.txtemail.focus();
return false;
}else
{       var str=document.form1.txtemail.value;
	    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")
		   document.form1.txtemail.focus();
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid E-mail ID")
		   document.form1.txtemail.focus();
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid E-mail ID")
			document.form1.txtemail.focus();
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid E-mail ID")
			document.form1.txtemail.focus();
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid E-mail ID")
			document.form1.txtemail.focus();
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Invalid E-mail ID")
			document.form1.txtemail.focus();
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Invalid E-mail ID")
			document.form1.txtemail.focus();
		    return false
		 }

 		 return true					
	
}

}