function emailcheck(email) 	                                        
{
	if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(email))
	{                                                               
		return false;
	}
	return true;
}
function LTrim(str){
	if (str==null){return null;}
	for(var i=0;str.charAt(i)==" ";i++);
	return str.substring(i,str.length);
	}
function RTrim(str){
	if (str==null){return null;}
	for(var i=str.length-1;str.charAt(i)==" ";i--);
	return str.substring(0,i+1);
	}
function Trim(str){return LTrim(RTrim(str));}

function chk_validity()
{	
	if(Trim(document.frm.comment.value) == "")
	{
		alert("Feedback should not be left blank.");
		document.frm.comment.value="";
		document.frm.comment.focus();
		return false;
	}
	if(Trim(document.frm.name.value) == "")
	{
		alert("Name should not be left blank.");
		document.frm.name.value="";
		document.frm.name.focus();
		return false;
	}
	if(Trim(document.frm.emailf.value) == "")
	{
		alert("Email should not be left blank");
		document.frm.emailf.value = "";
		document.frm.emailf.focus();
		return false;
	}
	if(emailcheck(document.frm.emailf.value))
	{
		alert("Please enter valid email address.");
		document.frm.emailf.focus();
		return false;
	}
	if(Trim(document.frm.phone.value) == "")
	{
		alert("Please enter your Phone Number.");
		document.frm.phone.focus();
		return false;
	}
	if(isNaN(document.frm.phone.value))
	{
		alert("Please enter valid Phone Number.");
		document.frm.phone.focus();
		return false;
	}
	
return true;
}
function resetAll()
 {
  document.frm.name.value="";
  document.frm.email.value="";
  document.frm.comment.value="";
  document.frm.phone.value="";
  }