var jmin=8;
var jmax=18;
function getElementsByClass(node,searchClass,tag) {  
     var classElements = new Array();  
         if ( node == null ) { 
             node = document;
		 }
         if ( tag == null ) {  
             tag = '*';  
		 }
     var els = node.getElementsByTagName(tag); // use "*" for all elements  
     var elsLen = els.length;  
     var pattern = new RegExp("\\b"+searchClass+"\\b");  
     for (i = 0, j = 0; i < elsLen; i++) {  
          if (pattern.test(els[i].className) ) {  
          classElements[j] = els[i];  
          j++;  
          }  
     }  
     return classElements;  
   }  
function increaseFontSize() {
   var pl = document.getElementsByTagName('p');
   for(i=0;i<pl.length;i++) {
      if(pl[i].style.fontSize) {
         var s = parseInt(pl[i].style.fontSize.replace("px",""));
      } else {
         var s = 12;
      }
      if(s<jmax) {
         s += 1;
      }
      pl[i].style.fontSize = s+"px"
	   pl[i].style.lineHeight = (s+4)+"px"
   }
    
}
function decreaseFontSize() {
     var pl = document.getElementsByTagName('p');
   for(i=0;i<pl.length;i++) {
      if(pl[i].style.fontSize) {
         var s = parseInt(pl[i].style.fontSize.replace("px",""));
      } else {
         var s = 12;
      }
      if(s>jmin) {
         s -= 1;
      }
      pl[i].style.fontSize = s+"px"
	  pl[i].style.lineHeight = (s+4)+"px"
   }
    
}