<!--
function toggleLayer( whichLayer )
{  var elem, vis;  
    if( document.getElementById )
      elem = document.getElementById( whichLayer );  
    else if( document.all )
      elem = document.all[whichLayer];  
    else if( document.layers )
      elem = document.layers[whichLayer];  
    vis = elem.style;  

    if(vis.display==''&&elem.offsetWidth!=undefined&&elem.offsetHeight!=undefined)    
      vis.display = (elem.offsetWidth!=0&&elem.offsetHeight!=0)?'block':'none';  
    
    vis.display = (vis.display==''||vis.display=='block')?'none':'block';
}

function validate_required(field,alerttxt)
{
with (field)
  {
  if (value==null||value=="")
    {
    alert(alerttxt);return false;
    }
  else
    {
    return true;
    }
  }
}

function validate_email(field,alerttxt)
{
    str = field.value;

	var at="@"
	var dot="."
	var lat=str.indexOf(at)
	var lstr=str.length
	var ldot=str.indexOf(dot)
	if (str.indexOf(at)==-1){
	   alert(alerttxt)
	   return false
	}

	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
	   alert(alerttxt)
	   return false
	}

	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
	    alert(alerttxt)
	    return false
	}

	 if (str.indexOf(at,(lat+1))!=-1){
	    alert(alerttxt)
	    return false
	 }

	 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
	    alert(alerttxt)
	    return false
	 }

	 if (str.indexOf(dot,(lat+2))==-1){
	    alert(alerttxt)
	    return false
	 }
	
	 if (str.indexOf(" ")!=-1){
	    alert(alerttxt)
	    return false
	 }

	 return true					
}

//-->