function trim(s)
{
    while (s.substring(0,1) == ' ') 
    {
        s = s.substring(1,s.length);
    }
    
    while (s.substring(s.length-1,s.length) == ' ') 
    {
        s = s.substring(0,s.length-1);
    }
    
    return s;
}

function check_empty(ctrl, form, ctrlname)
{
	obj = eval("document." + form + "." + ctrl)
    the_obj = trim(obj.value)	

    if (!obj)
	{
		alert (ctrl + " is not an object!")
		return 0
	}
	
    if (the_obj == '')
	{
		alert ("Please fill in the " + ctrlname + "!")
		obj.focus();
		return 1
	}
	return 0
}

function sure(ctrlname)
{
	if(confirm("Are you sure you want to delete this " + ctrlname + "?"))
		return true;
	else
		return false;
}

function shortPopUp( url, name, width, height, scrollbars ) 
{ 
	var top  = "0"; 
	var left = "0"; 
 
	if( scrollbars == null ) scrollbars = "0"; 
 
	str  = ""; 
	str += "resizable=1,titlebar=0,menubar=0,"; 
	str += "toolbar=0,location=0,directories=0,status=0,"; 
	str += "scrollbars=" + scrollbars + ","; 
	str += "width=" + width + ","; 
	str += "height=" + height + ","; 
	str += "top=" + top + ","; 
	str += "left=" + left; 
 
	window.open( url, name, str ); 
}

function check_img(ctrl, form)
{
	ext1 = eval("document." + form + "." + ctrl + ".value.substring(document." + form + "." + ctrl + ".value.lastIndexOf('.')+1,document." + form + "." + ctrl + ".value.length)");
	obj = eval("document." + form + "." + ctrl);
	if(ext1 != 'jpeg' && ext1 != 'gif' && ext1 != 'jpg' && ext1 != 'JPEG' && ext1 != 'GIF' && ext1 != 'JPG')
	{
		alert('Image format should be: \r JPEG, JPG or GIF!');
		obj.select();
		return false;
	}
	return true;
}

function check_file(ctrl, form)
{
	obj = eval("document." + form + "." + ctrl)
    the_obj = trim(obj.value)	

    if (!obj)
	{
		alert (ctrl + " is not an object!")
		return 0
	}
	
    if (the_obj == '')
	{
		return 1
	}
	return 0
}

function check_music(ctrl, form)
{
	ext1 = eval("document." + form + "." + ctrl + ".value.substring(document." + form + "." + ctrl + ".value.lastIndexOf('.')+1,document." + form + "." + ctrl + ".value.length)");
	obj = eval("document." + form + "." + ctrl);
	if(ext1 != 'mp3' && ext1 != 'MP3')
	{
		alert('Music format should be MP3!');
		obj.select();
		return false;
	}
	return true;
}