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_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v3.0
  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); 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];}
}

var rolloverImages = new Array();
rolloverImages[1] = 'light_sweet_over.gif';
rolloverImages[2] = 'natural_gas_over.gif';
rolloverImages[3] = 'heating_oil_over.gif';
rolloverImages[4] = 'gasoline_over.gif';
rolloverImages[5] = 'rbob_gasoline_over.gif';
rolloverImages[6] = 'elecricity_over.gif';
rolloverImages[7] = 'propane_over.gif';
rolloverImages[8] = 'coal_over.gif';
rolloverImages[9] = 'crack_spread_over.gif';
rolloverImages[10] = 'calendar_spread_over.gif';
rolloverImages[11] = 'nymex_miny_over.gif';
rolloverImages[12] = 'nymex_clearpot_over.gif';

var rolloverText = new Array();
rolloverText[1] =  '<b>LIGHT SWEET CRUDE OIL</b><!--<br>Futures, Options, NYMEX ClearPort, and miNYs-->';
rolloverText[2] =  '<b>NATURAL GAS</b><!--<br>Futures, Options, NYMEX ClearPort, and miNYs-->';
rolloverText[3] =  '<b>HEATING OIL</b><!--<br>Futures, Options, and NYMEX ClearPort-->';
rolloverText[4] =  '<b>GASOLINE</b><!--<br>Futures, Options, and NYMEX ClearPort-->';
rolloverText[5] =  '<b>RBOB GASOLINE</b><!--<br>Futures and Options-->';
rolloverText[6] =  '<b>ELECTRICITY</b><!--<br>NYMEX ClearPort-->';
rolloverText[7] =  '<b>PROPANE</b><!--<br>Futures-->';
rolloverText[8] =  '<b>COAL</b><!--<br>NYMEX ClearPort-->';
rolloverText[9] =  '<b>CRACK SPREAD OPTIONS</b><!--<br>Heating Oil/Crude Oil and Gasoline/Crude Oil-->';
rolloverText[10] =  '<b>CALENDAR SPREAD OPTIONS</b><!--<br>Crude Oil, Natural Gas, Heating Oil, and Gasoline-->';
rolloverText[11] =  '<b>NYMEX miNY</b><!--<br>Light Sweet Crude Oil and Natural Gas-->';
rolloverText[12] =  '<b>NYMEX CLEARPORT</b><!--<br>Crude Oil, Natural Gas, Petroleum Products, Electricity, and Coal-->';

var rolloverIds = new Array();
rolloverIds[1] = 'light_sweet';
rolloverIds[2] = 'natural_gas';
rolloverIds[3] = 'heating_oil';
rolloverIds[4] = 'gasoline';
rolloverIds[5] = 'rbob_gasoline';
rolloverIds[6] = 'elecricity';
rolloverIds[7] = 'propane';
rolloverIds[8] = 'coal';
rolloverIds[9] = 'crack_spread';
rolloverIds[10] = 'calendar_spread';
rolloverIds[11] = 'nymex_miny';
rolloverIds[12] = 'nymex_clearpot';

function rolloverIcon(index) {
	document.getElementById('maintext').innerHTML = rolloverText[index];
	MM_swapImage(rolloverIds[index], '', 'images/' + rolloverImages[index], 1);
}

function rolloutIcon() {
	document.getElementById('maintext').innerHTML = 'Select one of the above symbols.'; 
	MM_swapImgRestore();
}