function changeFontSize(step)
{
	step = parseInt(step);
	/*var el = document.getElementById(element);
	var curFont = parseInt(el.style.fontSize);
	el.style.fontSize = (curFont+step) + 'px';*/
	var p = document.getElementById("content").getElementsByTagName('p');
    for(i=0;i<p.length;i++) {
		if(p[i].style.fontSize) {
        	 var s = parseInt(p[i].style.fontSize.replace("px",""));
      	} else {
        	 var s = 12;
      	}
		p[i].style.fontSize = (s+step)+"px"

	}
	var p = document.getElementById("content").getElementsByTagName('li');
    for(i=0;i<p.length;i++) {
		if(p[i].style.fontSize) {
        	 var s = parseInt(p[i].style.fontSize.replace("px",""));
      	} else {
        	 var s = 12;
      	}
		p[i].style.fontSize = (s+step)+"px"

	}
	var p = document.getElementById("content").getElementsByTagName('td');
    for(i=0;i<p.length;i++) {
		if(p[i].style.fontSize) {
        	 var s = parseInt(p[i].style.fontSize.replace("px",""));
      	} else {
        	 var s = 12;
      	}
		p[i].style.fontSize = (s+step)+"px"

	}	

}