function validate_fields(){
var frm = document.f1;
	
	if(frm.uname.value==""){
		alert("Please provide your name");
		frm.uname.focus();
		return false;
	}
	
	else if(frm.uemail.value==""){
		alert("Please provide your email address");
		frm.uemail.focus();
		return false;
	}
	else if(!isEmail(frm.uemail.value))
	{
		alert("Please provide your valid email address");
		frm.uemail.focus();
		return false;
	}
	else if(frm.usubject.value==""){
		alert("Please provide your subject");
		frm.usubject.focus();
		return false;
	}
	else if(frm.utelephone.value==""){
		alert("Please provide your telephone number");
		frm.utelephone.focus();
		return false;
	}

	else if(frm.message.value==""){
		alert("Please provide a message");
		frm.message.focus();
		return false;
	}
	else{
		return true;
	}


}

function isEmail(mailstr)
{
	a = mailstr.indexOf(".");
	b = mailstr.indexOf("@");
	c = mailstr.indexOf(" ");
	d = mailstr.lastIndexOf(".");
	e = mailstr.length;
	if( (a == -1) || (b == -1) || (c != -1) || (d < b) || ( d == e - 1) || (b+1 == a) )
		return false;
	else
		return true;
}


// JavaScript Document