var c = 'normal'
/*function bigger() {
	if ( c == 'normal' )
	{
		document.getElementById("css").href = "css/style_medium.css";
		c = 'medium';
	}
	else if ( c == 'medium' )
	{
		document.getElementById("css").href = "css/style_big.css";
		c = 'big';
	}
}
function smaller() {
	
	if ( c == 'big' )
	{
		document.getElementById("css").href = "css/style_medium.css";
		c = 'medium'
	}
	else if( c == 'medium' )
	{
		document.getElementById("css").href = "css/style.css";
		c = 'normal'
	}
}*/
function bigger() {
	increaseFontSize('td');
	increaseFontSize('div');
	increaseFontSize('span');
	increaseFontSize('font');
}
function smaller() {
	decreaseFontSize('td');
	decreaseFontSize('div');
	decreaseFontSize('span');
	decreaseFontSize('font');
}
var min=9;
var max=16;
function increaseFontSize(xx) {
   var p = document.getElementsByTagName(xx);
   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;
      }
      if(s<max) {
         s += 1;
      }
      p[i].style.fontSize = s+"px"
   }
}
function decreaseFontSize(xx) {
   var p = document.getElementsByTagName(xx);
   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;
      }
      if(s>min) {
         s -= 1;
      }
      p[i].style.fontSize = s+"px"
   }   
}