var isNav4, isNav6, isIE4;
function setBr()
  {
    if (navigator.appVersion.charAt(0) == "4")
    {
        if (navigator.appName.indexOf("Explorer") >= 0)
        {
            isIE4 = true;
        }
        else
        {
            isNav4 = true;
        }
    }
    else if (navigator.appVersion.charAt(0) > "4")
    {
        isNav6 = true;
    }
}
setBr();
function setIdPr( id, property, value )
{
    if (isNav6)
    {
        var styleObject = document.getElementById( id );
        if (styleObject != null)
        {
            styleObject = styleObject.style;
            styleObject[ property ] = value;
        }
    }
    else if (isNav4)
    {
        document[id][property] = value;
    }
    else if (isIE4)
    {
         document.all[id].style[property] = value;
    }
}
//Nezadyljitelni parametri
//--form - ime na formata, v koqto se namirat div-te
//--start_div_element - obsht nachalen element na vsi4ki div-ve
function show_div(id, form, start_div_element) {   
	if(form)
	{
		var divs = document.getElementsByTagName('div');

		for (var i = 0; i < divs.length; i++) {
			var div = divs[i];
			if (div.id.indexOf(start_div_element) == 0)
			{
				setIdPr( div.id, "visibility", "hidden" );
			}
		}
	 }                        
	setIdPr( id, "visibility", "visible" );
};
function hide_div(id)
{
	setIdPr( id, "visibility", "hidden" );
};