function validate()
{
		with(document.contact_us)
		{
			if(name.value=="")
			{
				alert("enter name first");
				name.focus();
				return false;
			}
			if(email.value=="")
			{
				alert("enter email address");
				email.focus();
				return false;
			}
			if(echeck(email.value)==false)
			{
				alert("enter proper email address");
					email.focus();
					return false;
			}
			if(phone.value!="")
			{
				if(isNaN(phone.value))
				{
					alert("enter proper phone no");
					phone.focus();
					return false;
				}
				if(phone.value.length<8)
				{
				alert("enter proper phone no");
				phone.focus();
				return false;
				}
			}
			if(comments.value=="")
			{
				alert("enter your comments");
				comments.focus();
				return false;
			}
			if(subject.value=="")
			{
				alert("enter your subject");
				subject.focus();
				return false;
			}
			smail.value="send";
		}
}

	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					
	}