function toggleDiv(div_id)	
{
	div = $(div_id);
	
	if (div.style.display!='')
	{
		div.style.display='';
		div.style.visibility='visible';
	}
	else
	{
		div.style.display='none';
		div.style.visibility='hidden';
	}
}
	
function validateTxtNotEmpty(txt_id)
{
	var txt = document.getElementById(txt_id);
	if(txt==null)	
		return false;
		
	if(	txt.value==null || txt.value=="" )
	{
		txt.focus();
		return false;
	}
	
	return true;	
	
}

function validateTxtEmail(txt_id)
{
	var txt = document.getElementById(txt_id);
	if(txt==null)	
		return false;
	
	if(txt.value==null)	
		return false;
		
	return validateEmail(txt.value);
	
}

function validateEmail(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 address (@)")
	   return false
	}

	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
	   alert("Invalid E-mail address (@)")
	   return false
	}

	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
	    alert("Invalid E-mail address (.)")
	    return false
	}

	 if (str.indexOf(at,(lat+1))!=-1){
	    alert("Invalid E-mail address (@)")
	    return false
	 }

	 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
	    alert("Invalid E-mail address (4)")
	    return false
	 }

	 if (str.indexOf(dot,(lat+2))==-1){
	    alert("Invalid E-mail address (5)")
	    return false
	 }
	
	 if (str.indexOf(" ")!=-1){
	    alert("Invalid E-mail address. Spaces not allowed here")
	    return false
	 }

	 return true					
}