function changeSizeText(idElement, size)
{
	if (document.getElementById(idElement).hasChildNodes())
	{
		// So, first we check if the object is not empty, if the object has child nodes
	   var children = document.getElementById(idElement).childNodes;
	   var newSize = parseInt(textSize + size);
	   if(newSize >= 10 &&  newSize <= 18)
	   {
	   		textSize = newSize;
	   }
	   else
	   {
	   		if(newSize < 10)
	   		{
	   			textSize = 8;
	   			newSize=8;
	   		}
	   		else
	   		{
	   			textSize = 18;
				newSize=18;   			
	   		}
	   }
	   for (var i=0;i<children.length;i++) 
	   {
		   	if(document.getElementById(idElement).childNodes[i].nodeType==1)
		   	{
		   		var newInterligne = newSize + 2;
				document.getElementById(idElement).childNodes[i].style.fontSize=newSize+'px';   
				document.getElementById(idElement).childNodes[i].style.lineHeight=newInterligne+'px';
	   		}
	   }
	 }
}