It seems you are going for something like this:
HTML:
<div class="content" id="con_a">Hello world.</div>
<div id="show_con_a" style="display:none">Show Me on content div "a" hover</div>
<div class="content" id="con_b">Nice to meet you.</div>
<div id="show_con_b" style="display:none">Show Me on content div "b" hover</div>
<div class="content" id="con_c">See you later.</div>
<div id="show_con_c" style="display:none">Show Me content div "c" hover</div>
JAVASCRIPT:
//Collect all divs with 'content' class
$('.content').each(function(){
//Set mouse handler for each content div
$(this).hover(function(){
$('#show_' + this.id).show();
},
function(){
$('#show_' + this.id).hide();
});
});
ALTERNATIVE JAVASCRIPT:
//Collect all divs with an id that begins with 'con_'
$("[id=^'con_']").each(function(){
//Set mouse handler for each content div
$(this).hover(function(){
$('#show_' + this.id).show();
},
function(){
$('#show_' + this.id).hide();
});
});