function start_search_item()
{
	with (document.forms[0])
	{
		if(search_item.value == "")
		{
			alert("Es wurde kein Suchbegriff eingegeben.");
			eval(search_item).focus();
			return false;
			//alert("start_search("+pattern+")");
		}
		eval(search_author).value = "";
		eval(search_title).value = "";
		eval(search_reihe).value = "";
		eval(search_isbn).value = "";		
		submit();
	}	
}

function start_search_author()
{
	with (document.forms[0])
	{
		if(search_author.value == "")
		{
			alert("Es wurde kein Suchbegriff eingegeben.");
			eval(search_author).focus();
			return false;
			//alert("start_search("+pattern+")");
		}
		eval(search_item).value = "";
		eval(search_title).value = "";
		eval(search_reihe).value = "";
		eval(search_isbn).value = "";		
		submit();
	}	
}

function start_search_title()
{
	with (document.forms[0])
	{	
		if(search_title.value == "")
		{
			alert("Es wurde kein Suchbegriff eingegeben.");
			eval(search_title).focus();
			return false;
			//alert("start_search("+pattern+")");
		}
		eval(search_item).value = "";
		eval(search_author).value = "";
		eval(search_reihe).value = "";
		eval(search_isbn).value = "";		
		submit();
	}	
}

function start_search_reihe()
{
	with (document.forms[0])
	{	
		action = "search_result_reihe.php";
		
		if(search_reihe.value == "")
		{
			alert("Es wurde kein Suchbegriff eingegeben.");
			eval(search_reihe).focus();
			return false;
			//alert("start_search("+pattern+")");
		}
		eval(search_item).value = "";
		eval(search_author).value = "";
		eval(search_title).value = "";
		eval(search_isbn).value = "";		
		submit();
	}	
}

function start_search_isbn()
{
	with (document.forms[0])
	{	
		var reg = /\d+\x+\X/;
		if (reg.exec(eval(search_isbn).value) || search_isbn.value == "")
		{
			alert("Es wurde keine gültige ISBN eingegeben.");
			eval(search_isbn).value = "";
			eval(search_isbn).focus();
			return false;
			//alert("start_search("+pattern+")");
		}
				
		eval(search_item).value = "";
		eval(search_author).value = "";		
		eval(search_title).value = "";
		eval(search_reihe).value = "";
		submit();
	}	
}

function start_search()
{
	with (document.forms[0])
	{
		if(search_title.value == "")
			{
				alert("Es wurde kein Suchbegriff eingegeben.");
				eval(search_title).focus();
				return false;
			//alert("start_search("+pattern+")");
			}
		submit();
	}	
}

function returnItem()
{
	with (document.forms[0])
	{
		if(event.keyCode == '13')
		{
			start_search_item();
		}
	}
}

function returnAuthor()
{
	with (document.forms[0])
	{
		if(event.keyCode == '13')
		{
			start_search_author();
		}
	}
}

function returnTitle()
{
	with (document.forms[0])
	{
		if(event.keyCode == '13')
		{
			start_search_title();
		}
	}
}

function returnReihe()
{
	with (document.forms[0])
	{
		if(event.keyCode == '13')
		{
			start_search_reihe();
		}
	}
}

function returnISBN()
{
	with (document.forms[0])
	{
		if(event.keyCode == '13')
		{
			start_search_isbn();
		}
	}
}