function newButton(idCell)
	{
	document.getElementById(idCell).style.backgroundImage = 'url(images/knopka_big_2.gif)';
	}

function backButton(idCell)
	{
	document.getElementById(idCell).style.backgroundImage = 'url(images/knopka_big_1.gif)';
	}

function view_table(param)
	{
	document.getElementById(param).style.visibility = 'visible';

	if (param == 1)
		{
		newButton('c1');
		document.getElementById("link1").innerHTML = '<a href="#" onClick="hide_table(1); return false;" class="mainmenu1">каталог<br /><img src="images/1x1px.gif" alt="" border="0" width="27" height="25"></a>';
		}
	else if (param == 2)
		{
		newButton('c2');
		document.getElementById("link2").innerHTML = '<a href="#" onClick="hide_table(2); return false;" class="mainmenu1">новости<br /><img src="images/1x1px.gif" alt="" border="0" width="27" height="25"></a>';
		}
	else if (param == 3)
		{
		newButton('c3');
		document.getElementById("link3").innerHTML = '<a href="#" onClick="hide_table(3); return false;" class="mainmenu1">предложения<br /><img src="images/1x1px.gif" alt="" border="0" width="27" height="25"></a>';
		}
	else if (param == 4)
		{
		newButton('c4');
		document.getElementById("link4").innerHTML = '<a href="#" onClick="hide_table(4); return false;" class="mainmenu1">о нас<br /><img src="images/1x1px.gif" alt="" border="0" width="27" height="25"></a>';
		}
	else if (param == 5)
		{
		newButton('c5');
		document.getElementById("link5").innerHTML = '<a href="#" onClick="hide_table(5); return false;" class="mainmenu1">контакты<br /><img src="images/1x1px.gif" alt="" border="0" width="27" height="25"></a>';
		}
	else
		alert('no link!');

	//make all other invisible
	for (i=1; i<=5; i=i+1)
		{
		if (i != param)
			{
			document.getElementById(i).style.visibility = 'hidden';
			if (i == 1)
				{
				backButton('c1');
				document.getElementById("link1").innerHTML = '<a href="#" onClick="view_table(1); return false;" class="mainmenu">каталог<br /><img src="images/1x1px.gif" alt="" border="0" width="27" height="25"></a>';
				}
			else if (i == 2)
				{
				backButton('c2');
				document.getElementById("link2").innerHTML = '<a href="#" onClick="view_table(2); return false;" class="mainmenu">новости<br /><img src="images/1x1px.gif" alt="" border="0" width="27" height="25"></a>';
				}
			else if (i == 3)
				{
				backButton('c3');
				document.getElementById("link3").innerHTML = '<a href="#" onClick="view_table(3); return false;" class="mainmenu">предложения<br /><img src="images/1x1px.gif" alt="" border="0" width="27" height="25"></a>';
				}
			else if (i == 4)
				{
				backButton('c4');
				document.getElementById("link4").innerHTML = '<a href="#" onClick="view_table(4); return false;" class="mainmenu">о нас<br /><img src="images/1x1px.gif" alt="" border="0" width="27" height="25"></a>';
				}
			else if (i == 5)
				{
				backButton('c5');
				document.getElementById("link5").innerHTML = '<a href="#" onClick="view_table(5); return false;" class="mainmenu">контакты<br /><img src="images/1x1px.gif" alt="" border="0" width="27" height="25"></a>';
				}
			else
				alert('no link!');
			}
		}
	}

function hide_table(param)
	{
	document.getElementById(param).style.visibility = 'hidden';
	if (param == 1)
		{
		backButton('c1');
		document.getElementById("link1").innerHTML = '<a href="#" onClick="view_table(1); return false;" class="mainmenu">каталог<br /><img src="images/1x1px.gif" alt="" border="0" width="27" height="25"></a>';
		}
	else if (param == 2)
		{
		backButton('c2');
		document.getElementById("link2").innerHTML = '<a href="#" onClick="view_table(2); return false;" class="mainmenu">новости<br /><img src="images/1x1px.gif" alt="" border="0" width="27" height="25"></a>';
		}
	else if (param == 3)
		{
		backButton('c3');
		document.getElementById("link3").innerHTML = '<a href="#" onClick="view_table(3); return false;" class="mainmenu">предложения<br /><img src="images/1x1px.gif" alt="" border="0" width="27" height="25"></a>';
		}
	else if (param == 4)
		{
		backButton('c4');
		document.getElementById("link4").innerHTML = '<a href="#" onClick="view_table(4); return false;" class="mainmenu">о нас<br /><img src="images/1x1px.gif" alt="" border="0" width="27" height="25"></a>';
		}
	else if (param == 5)
		{
		backButton('c5');
		document.getElementById("link5").innerHTML = '<a href="#" onClick="view_table(5); return false;" class="mainmenu">контакты<br /><img src="images/1x1px.gif" alt="" border="0" width="27" height="25"></a>';
		}
	else
		alert('no link!');
	}

function newButton1(idCell)
	{
	document.getElementById(idCell).style.backgroundImage = 'url(images/knopka_small_1.gif)';
	}

function backButton1(idCell)
	{
	document.getElementById(idCell).style.backgroundImage = 'url(images/knopka_small_2.gif)';
	}