/**
* spFontSizer increase/decrease font size inside "spEmStep"
*
* use: spFontSizer(1, false), spFontSizer(-1, false) or spFontSizer(0, true)
* @param spInc set to 1 or -1
* @param spReset set to true to get initial font size
*/
function spFontSizer(spValue) {
	
	var fontsizes = new Array(8.5,9,11);
			
	// inside allowed steps?
	// spEmBody = document.getElementById('spMainContent');
	spEmBody = document.getElementsByTagName('body')[0];
	// set new fot size
	spEmBody.style.fontSize = fontsizes[spValue] + "pt";

}