function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

if (smenu==1) {
button1='bt01_on.gif';
} else {
button1='bt01.gif';
}
if (smenu==2) {
button2='bt02_on.gif';
} else {
button2='bt02.gif';
}
if (smenu==3) {
button3='bt03_on.gif';
} else {
button3='bt03.gif';
}
if (smenu==4) {
button4='bt04_on.gif';
} else {
button4='bt04.gif';
}
if (smenu==5) {
button5='bt05_on.gif';
} else {
button5='bt05.gif';
}
if (smenu==6) {
button6='bt06_on.gif';
} else {
button6='bt06.gif';
}
<!--
function writeJS(){
var str='';
str+='<style type="text\/css">';
str+='<!--';
str+='.texto10 a{';
str+='	font-family: Verdana, Arial, Helvetica, sans-serif;';
str+='	font-size: 10px;';
str+='	color: #003399;';
str+='}';
str+='.texto10 {';
str+='	font-family: Verdana, Arial, Helvetica, sans-serif;';
str+='	font-size: 10px;';
str+='	color: #003399;';
str+='}';
str+='-->';
str+='<\/style>';
str+='<table border="0" cellpadding="0" cellspacing="0" height="154" width="776">';
str+='  <tr>';
str+='   <td><img src="images\/spacer.gif" width="16" height="1" border="0" alt="" \/><\/td>';
str+='   <td><img src="images\/spacer.gif" width="134" height="1" border="0" alt="" \/><\/td>';
str+='   <td><img src="images\/spacer.gif" width="1" height="1" border="0" alt="" \/><\/td>';
str+='   <td><img src="images\/spacer.gif" width="55" height="1" border="0" alt="" \/><\/td>';
str+='   <td><img src="images\/spacer.gif" width="1" height="1" border="0" alt="" \/><\/td>';
str+='   <td><img src="images\/spacer.gif" width="33" height="1" border="0" alt="" \/><\/td>';
str+='   <td><img src="images\/spacer.gif" width="24" height="1" border="0" alt="" \/><\/td>';
str+='   <td><img src="images\/spacer.gif" width="1" height="1" border="0" alt="" \/><\/td>';
str+='   <td><img src="images\/spacer.gif" width="163" height="1" border="0" alt="" \/><\/td>';
str+='   <td><img src="images\/spacer.gif" width="1" height="1" border="0" alt="" \/><\/td>';
str+='   <td><img src="images\/spacer.gif" width="137" height="1" border="0" alt="" \/><\/td>';
str+='   <td><img src="images\/spacer.gif" width="1" height="1" border="0" alt="" \/><\/td>';
str+='   <td><img src="images\/spacer.gif" width="92" height="1" border="0" alt="" \/><\/td>';
str+='   <td><img src="images\/spacer.gif" width="1" height="1" border="0" alt="" \/><\/td>';
str+='   <td><img src="images\/spacer.gif" width="116" height="1" border="0" alt="" \/><\/td>';
str+='   <td><img src="images\/spacer.gif" width="1" height="1" border="0" alt="" \/><\/td>';
str+='  <\/tr>';
//str+='  <tr>';
//str+='   <td colspan="15" class="texto10"><div align="right"><a href="#">Mapa del Sitio<\/a> | <a href="#">Atenci&oacute;n al cliente<\/a><\/div><\/td>';
//str+='   <td><img src="images\/spacer.gif" width="1" height="28" border="0" alt="" \/><\/td>';
//str+='  <\/tr>';
str+='  <tr>';
str+='   <td colspan="15" class="texto10"><div align="right"><\/div><\/td>';
str+='   <td><img src="images\/spacer.gif" width="1" height="28" border="0" alt="" \/><\/td>';
str+='  <\/tr>';
str+='  <tr>';
str+='   <td rowspan="2"> <\/td>';
str+='   <td colspan="5"><img name="cabecera_r2_c2" src="images\/cabecera_r2_c2.gif" width="224" height="71" border="0" id="cabecera_r2_c2" alt="" \/><\/td>';
str+='   <td rowspan="2" colspan="9"> <\/td>';
str+='   <td><img src="images\/spacer.gif" width="1" height="71" border="0" alt="" \/><\/td>';
str+='  <\/tr>';
str+='  <tr>';
str+='   <td colspan="5"> <\/td>';
str+='   <td><img src="images\/spacer.gif" width="1" height="27" border="0" alt="" \/><\/td>';
str+='  <\/tr>';
str+='  <tr>';
str+='   <td colspan="2"><a href="bienvenida.htm"><img src="images\/'+button1+'" alt="" name="cabecera_r4_c1" width="150" height="28" border="0" id="cabecera_r4_c1" onMouseOver="MM_swapImage(\'cabecera_r4_c1\',\'\',\'images\/bt01_on.gif\',1)" onMouseOut="MM_swapImgRestore()" \/><\/a><\/td>';
str+='   <td><img name="cabecera_r4_c3" src="images\/cabecera_r4_c3.gif" width="1" height="28" border="0" id="cabecera_r4_c3" alt="" \/><\/td>';
str+='   <td colspan="4"><a href="sede.htm"><img src="images\/'+button2+'" alt="" name="cabecera_r4_c4" width="113" height="28" border="0" id="cabecera_r4_c4" onMouseOver="MM_swapImage(\'cabecera_r4_c4\',\'\',\'images\/bt02_on.gif\',1)" onMouseOut="MM_swapImgRestore()" \/><\/a><\/td>';
str+='   <td><img name="cabecera_r4_c8" src="images\/cabecera_r4_c8.gif" width="1" height="28" border="0" id="cabecera_r4_c8" alt="" \/><\/td>';
str+='   <td><a href="const_emedicas.htm"><img src="images\/'+button3+'" alt="" name="cabecera_r4_c9" width="163" height="28" border="0" id="cabecera_r4_c9" onMouseOver="MM_swapImage(\'cabecera_r4_c9\',\'\',\'images\/bt03_on.gif\',1)" onMouseOut="MM_swapImgRestore()" \/><\/a><\/td>';
str+='   <td><img name="cabecera_r4_c10" src="images\/cabecera_r4_c10.gif" width="1" height="28" border="0" id="cabecera_r4_c10" alt="" \/><\/td>';
str+='   <td><a href="familia.htm"><img src="images\/'+button4+'" alt="" name="cabecera_r4_c11" width="137" height="28" border="0" id="cabecera_r4_c11" onMouseOver="MM_swapImage(\'cabecera_r4_c11\',\'\',\'images\/bt04_on.gif\',1)" onMouseOut="MM_swapImgRestore()" \/><\/a><\/td>';
str+='   <td><img name="cabecera_r4_c12" src="images\/cabecera_r4_c12.gif" width="1" height="28" border="0" id="cabecera_r4_c12" alt="" \/><\/td>';
str+='   <td><a href="const_servicios.htm"><img src="images\/'+button5+'" alt="" name="cabecera_r4_c13" width="92" height="28" border="0" id="cabecera_r4_c13" onMouseOver="MM_swapImage(\'cabecera_r4_c13\',\'\',\'images\/bt05_on.gif\',1)" onMouseOut="MM_swapImgRestore()" \/><\/a><\/td>';
str+='   <td><img name="cabecera_r4_c14" src="images\/cabecera_r4_c14.gif" width="1" height="28" border="0" id="cabecera_r4_c14" alt="" \/><\/td>';
str+='   <td><a href="contac.htm"><img src="images\/'+button6+'" alt="" name="cabecera_r4_c15" width="116" height="28" border="0" id="cabecera_r4_c15" onMouseOver="MM_swapImage(\'cabecera_r4_c15\',\'\',\'images\/bt06_on.gif\',1)" onMouseOut="MM_swapImgRestore()" \/><\/a><\/td>';
str+='   <td><img src="images\/spacer.gif" width="1" height="28" border="0" alt="" \/><\/td>';
str+='  <\/tr>';
str+='<\/table>';
document.write(str);
}
writeJS();