function changeFontSize(size)
            {
                var p = document.getElementsByTagName('p');
                for( var n=0;n < p.length; n++)
                {
                    p[n].style.fontSize = size + 'em';
                }
            }
            function small(frm)
            {
                changeFontSize('0.8');//changing font size
                changeInputFieldSize('0.8');//changing input box size;
                if(frm=="i")
                    {
                        //do nothing
                    }
                    else
                    {
                        changeImages("small",frm);// apply corresponding images;
                    }

                document.getElementById("maintable").style.width="785";
                try
                {
                    document.getElementById("font").value ="small();";
                }catch(error){}
            }
            function medium(frm)
            {
                changeFontSize('1.25');//changing font size
                changeInputFieldSize('1.25');//changing input box size;
                if(frm=="i")
                    {
                        //do nothing
                    }
                    else
                    {
                        changeImages("medium",frm);// apply corresponding images;
                    }
                document.getElementById("maintable").style.width="985";
                try
                {
                    document.getElementById("font").value ="medium();";
                }catch(error){}
            }
            function large(frm)
            {
                changeFontSize('1.75');//changing font size
                changeInputFieldSize('1.75');//changing input box size;
                if(frm=="i")
                    {
                        //do nothing
                    }
                    else
                    {
                        changeImages("large",frm);// apply corresponding images;
                    }
                document.getElementById("maintable").style.width="1185";
                try
                {
                 document.getElementById("font").value ="large();";
                }catch(error){}
                 
            }
            function changeInputFieldSize(size)
            {
                var input = document.getElementsByTagName('input');
                for( var n=0;n < input.length; n++)
                {
                    input[n].style.fontSize = size + 'em';
                }
            }
            function changeImages(img,frm)
            {
                try
                {
                    document.getElementById("down").src="img/default/"+ img +"/pfeil_down.gif";
                    document.getElementById("up1").src="img/default/"+ img +"/pfeil_vor.gif";
                    document.getElementById("up2").src="img/default/"+ img +"/pfeil_vor.gif";
                    if(frm=="b")
                        document.getElementById("up3").src="img/default/"+ img +"/pfeil_vor.gif";
                    document.getElementById("down1").src="img/default/"+ img +"/pfeil_down.gif";
                    
                }catch(error)
                {}
            }