function checkform()
{
	if (document.form1.name.value.length==0)
	{
alert("please enter your name ");
document.form1.name.focus();
return false;
		
	}
		
	if (document.form1.email.value=="")
	{
alert("please enter your email ");
document.form1.email.focus();

		return false;
	}
	
	
	if (echeck(document.form1.email.value)==false){
		document.form1.email.value=""
		document.form1.email.focus()
		return false
	}	
		if (document.form1.phone.value=="")
	{
alert("please enter your Phone No ");
document.form1.phone.focus();

		return false;
	}	
	if (document.form1.subject.value=="")
	{
alert("please enter your subject ");
document.form1.subject.focus();

		return false;
	}	
	
	if (document.form1.msg.value=="")
	{
alert("please enter your message ");
document.form1.msg.focus();

		return false;
	}	
	
	if (document.form1.security_code.value=="")
	{
alert("please enter security code ");
document.form1.security_code.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					
	}