function IsNumeric(sText)
{	var ValidChars = "0123456789.";
	var IsNumber=true;
	var Char;
	for (i = 0; i < sText.length && IsNumber == true; i++){ 
		Char = sText.charAt(i); 
		if (ValidChars.indexOf(Char) == -1){
			IsNumber = false;
		}
	}
	if(sText == ''){IsNumber = false;}

	return IsNumber;
}

function checkfile(idText)
{	var good_label = false;
	var good_selection = false;
	obj_select = document.getElementById(idText);
	if(obj_select.value == ""){alert("Please provide a file.");}
	else{good_selection = true;}
	
	return good_selection;
}

function change_link_path_type(link_path_id_num, element_id, element_sel_id)
{	input_obj = document.getElementById(element_id);
	select_obj = document.getElementById(element_sel_id);
	
	if(link_path_id_num == '1')
	{	if(input_obj.disabled != ''){input_obj.disabled = '';}
		if(select_obj.disabled != 'disabled'){select_obj.disabled = 'disabled';}
		input_obj.value = 'mailto:';
	}
	if(link_path_id_num == "2")
	{	if(select_obj.disabled != ''){select_obj.disabled = '';}
		if(input_obj != 'disabled'){input_obj.disabled = 'disabled';}
	}
	if(link_path_id_num == '3')
	{	if(input_obj.disabled != ''){input_obj.disabled = '';}
		if(select_obj.disabled != 'disabled'){select_obj.disabled = 'disabled';}
		input_obj.value = "";
	}
}

function image_preload(image_url)
{	if (document.images)
	{	preload_image_object = new Image();
		
		var i = 0;
		for(i=0; i<image_url.length; i++)
			{preload_image_object.src = image_url[i];}
	}
}