var spEmStepWidth 	= 0.15;	// increase/decrease font every step by spEmStepWidth
var spEmBasis 		= 1.0;	// font size of spArticleBody at startup
var spEmStep 		= 1;	// counter for current step (leave as 0)
var spEmMaxSteps 	= 2;	// maximum steps alowed
spEmStep = 0;

function spFontSizer(spInc, spReset) {
// reset font size
if (spReset)
spEmStep = 1;

// inside allowed steps?
if (Math.abs(spEmStep + spInc) <= spEmMaxSteps) {
// increase/decrease spEmStep
spEmStep += spInc;


// set new font size for every tag inside "spEmStep"
spEmFontSize = spEmStep * spEmStepWidth + spEmBasis;
//get spArticleBody
spEmBody = document.getElementById('content');
// set new font size
spEmBody.style.fontSize = spEmFontSize + "em";
}
if (spEmStep == -spEmMaxSteps) {
document.getElementById("spFontsizeMinus").src = "http://www.hospital-fritzlar.de/cms/upload/minus_max.jpg";
//alert("1 mit Stufe " + spEmStep);
}
else if (spEmStep == spEmMaxSteps) {
document.getElementById("spFontsizePlus").src = "http://www.hospital-fritzlar.de/cms/upload/plus_max.jpg";
//alert("2 mit Stufe " + spEmStep)
}
else {
document.getElementById("spFontsizePlus").src = "http://www.hospital-fritzlar.de/cms/upload/plus.GIF";
document.getElementById("spFontsizeMinus").src = "http://www.hospital-fritzlar.de/cms/upload/minus.GIF";
//if (spEmStep <= -1){spEmStep == 1;}
//alert("3 mit Stufe " + spEmStep);
}  
}