var minSize=10;
var maxSize=20;

function increaseFontSize() {
	var obj= $('#insideContent td,#insideContent p,#insideContent a,#insideContent em');
	var currentFontSize = $(obj).css('font-size');
	var currentFontSizeNum = parseFloat(currentFontSize.replace('px',''), 10);
	var newFontSize = currentFontSizeNum+2;
	if(newFontSize<=maxSize) $(obj).css('font-size', newFontSize+'px');
}

function decreaseFontSize() {
	var obj= $('#insideContent td,#insideContent p,#insideContent a,#insideContent em');
	var currentFontSize = $(obj).css('font-size');
        var currentFontSizeNum = parseFloat(currentFontSize.replace('px',''), 10);
	var newFontSize = currentFontSizeNum-2;
        if(newFontSize>=minSize) $(obj).css('font-size', newFontSize+'px');
}