function validate_contactus(form)
{
	if ((form.Name.value==null)||(form.Name.value==""))
	{
		alert("Please enter your name");
		form.Name.focus();
		return false;
	}	
	else if ((form.PhoneNumber.value==null)||(form.PhoneNumber.value==""))
	{
		alert("Please enter your Phone Number");
		form.PhoneNumber.focus();
		return false;
	}	
	else if ((form.email.value==null)||(form.email.value==""))
	{
		alert("Please enter a valid email");
		form.email.focus();
		return false;
	}	
	else if (echeck(form.email.value)==false)
	{
		form.email.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("The E-mail that you have entered is not valid")
	   return false
	}

	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
	   alert("The E-mail that you have entered is not valid")
	   return false
	}

	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		alert("The E-mail that you have entered is not valid")
		return false
	}

	 if (str.indexOf(at,(lat+1))!=-1){
		alert("The E-mail that you have entered is not valid")
		return false
	 }

	 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		alert("The E-mail that you have entered is not valid")
		return false
	 }

	 if (str.indexOf(dot,(lat+2))==-1){
		alert("The E-mail that you have entered is not valid")
		return false
	 }
	
	 if (str.indexOf(" ")!=-1){
		alert("The E-mail that you have entered is not valid")
		return false
	 }
	 return true					
}//function echeck(str)